From 956df9912a1bec53feecec0504a0383f0dab7ea5 Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Wed, 26 May 2021 17:34:56 +0100
Subject: [PATCH 01/12] Update black et al (#4155)

* update pre-commit packages

* blackify files to new version

* review actions

* update pyproject.toml
---
 .pre-commit-config.yaml                       | 6 +++---
 lib/iris/fileformats/netcdf.py                | 2 +-
 lib/iris/tests/integration/test_netcdf.py     | 2 +-
 lib/iris/tests/test_cube_to_pp.py             | 2 +-
 lib/iris/tests/test_file_save.py              | 6 +++---
 lib/iris/tests/unit/fileformats/test_rules.py | 2 +-
 noxfile.py                                    | 2 +-
 pyproject.toml                                | 2 +-
 requirements/ci/py36.yml                      | 2 +-
 requirements/ci/py37.yml                      | 2 +-
 requirements/ci/py38.yml                      | 2 +-
 requirements/test.txt                         | 2 +-
 12 files changed, 16 insertions(+), 16 deletions(-)

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index cea9d3585d..0833790fc2 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -2,7 +2,7 @@
 # See https://pre-commit.com/hooks.html for more hooks
 repos:
 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: 'v3.4.0'
+    rev: 'v4.0.1'
     hooks:
         # Prevent giant files from being committed.
     -   id: check-added-large-files
@@ -17,14 +17,14 @@ repos:
         # Don't commit to master branch.
     -   id: no-commit-to-branch
 -   repo: https://github.com/psf/black
-    rev: '20.8b1'
+    rev: '21.5b1'
     hooks:
     -   id: black
         # Force black to run on whole repo, using settings from pyproject.toml
         pass_filenames: false
         args: [--config=./pyproject.toml, .]
 -   repo: https://github.com/PyCQA/flake8
-    rev: '3.9.0'
+    rev: '3.9.2'
     hooks:
         # Run flake8.
     -   id: flake8
diff --git a/lib/iris/fileformats/netcdf.py b/lib/iris/fileformats/netcdf.py
index def393f0a3..206f7526c6 100644
--- a/lib/iris/fileformats/netcdf.py
+++ b/lib/iris/fileformats/netcdf.py
@@ -2655,7 +2655,7 @@ def save(
         local_keys.update(different_value_keys)
 
     def is_valid_packspec(p):
-        """ Only checks that the datatype is valid. """
+        """Only checks that the datatype is valid."""
         if isinstance(p, dict):
             if "dtype" in p:
                 return is_valid_packspec(p["dtype"])
diff --git a/lib/iris/tests/integration/test_netcdf.py b/lib/iris/tests/integration/test_netcdf.py
index 267e5beb50..3bf1e6032e 100644
--- a/lib/iris/tests/integration/test_netcdf.py
+++ b/lib/iris/tests/integration/test_netcdf.py
@@ -516,7 +516,7 @@ def test_single_packed_signed(self):
         self._single_test("i2", "single_packed_signed.cdl")
 
     def test_single_packed_unsigned(self):
-        """Test saving a single CF-netCDF file with packing into unsigned. """
+        """Test saving a single CF-netCDF file with packing into unsigned."""
         self._single_test("u1", "single_packed_unsigned.cdl")
 
     def test_single_packed_manual_scale(self):
diff --git a/lib/iris/tests/test_cube_to_pp.py b/lib/iris/tests/test_cube_to_pp.py
index d0a1e0dcbb..f5d7a4482c 100644
--- a/lib/iris/tests/test_cube_to_pp.py
+++ b/lib/iris/tests/test_cube_to_pp.py
@@ -275,7 +275,7 @@ def test_365_calendar_export(self):
 
 
 class FakePPEnvironment:
-    """ fake a minimal PP environment for use in cross-section coords, as in PP save rules """
+    """fake a minimal PP environment for use in cross-section coords, as in PP save rules"""
 
     y = [1, 2, 3, 4]
     z = [111, 222, 333, 444]
diff --git a/lib/iris/tests/test_file_save.py b/lib/iris/tests/test_file_save.py
index 1c2a27c70b..ee48969865 100644
--- a/lib/iris/tests/test_file_save.py
+++ b/lib/iris/tests/test_file_save.py
@@ -33,7 +33,7 @@
 
 
 def save_by_filename(filename1, filename2, cube, saver_fn, iosaver=None):
-    """ Saves a cube to two different filenames using iris.save and the save method of the object representing the file type directly"""
+    """Saves a cube to two different filenames using iris.save and the save method of the object representing the file type directly"""
     # Save from object direct
     saver_fn(cube, filename1)
 
@@ -46,7 +46,7 @@ def save_by_filename(filename1, filename2, cube, saver_fn, iosaver=None):
 def save_by_filehandle(
     filehandle1, filehandle2, cube, fn_saver, binary_mode=True
 ):
-    """ Saves a cube to two different filehandles using iris.save and the save method of the object representing the file type directly"""
+    """Saves a cube to two different filehandles using iris.save and the save method of the object representing the file type directly"""
     mode = "wb" if binary_mode else "w"
 
     # Save from object direct
@@ -60,7 +60,7 @@ def save_by_filehandle(
 
 @tests.skip_data
 class TestSaveMethods(tests.IrisTest):
-    """ Base class for file saving tests. Loads data and creates/deletes tempfiles"""
+    """Base class for file saving tests. Loads data and creates/deletes tempfiles"""
 
     def setUp(self):
         self.cube1 = iris.load_cube(
diff --git a/lib/iris/tests/unit/fileformats/test_rules.py b/lib/iris/tests/unit/fileformats/test_rules.py
index 00b0e5c540..730ef13f23 100644
--- a/lib/iris/tests/unit/fileformats/test_rules.py
+++ b/lib/iris/tests/unit/fileformats/test_rules.py
@@ -238,7 +238,7 @@ def converter(field):
 
 
 class Test_scalar_cell_method(tests.IrisTest):
-    """ Tests for iris.fileformats.rules.scalar_cell_method() function """
+    """Tests for iris.fileformats.rules.scalar_cell_method() function"""
 
     def setUp(self):
         self.cube = stock.simple_2d()
diff --git a/noxfile.py b/noxfile.py
index bf6c95acf6..848243eac4 100755
--- a/noxfile.py
+++ b/noxfile.py
@@ -190,7 +190,7 @@ def black(session: nox.sessions.Session):
 
     """
     # Pip install the session requirements.
-    session.install("black==20.8b1")
+    session.install("black==21.5b1")
     # Execute the black format checker on the package.
     session.run("black", "--check", PACKAGE)
     # Execute the black format checker on this file.
diff --git a/pyproject.toml b/pyproject.toml
index 353f3df53f..31bc0bca0e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.black]
 line-length = 79
-target-version = ['py36', 'py37']
+target-version = ['py36', 'py37', 'py38']
 include = '\.pyi?$'
 exclude = '''
 
diff --git a/requirements/ci/py36.yml b/requirements/ci/py36.yml
index f778704803..1543075948 100644
--- a/requirements/ci/py36.yml
+++ b/requirements/ci/py36.yml
@@ -34,7 +34,7 @@ dependencies:
 
 # Test dependencies.
   - asv
-  - black=20.8b1
+  - black=21.5b1
   - filelock
   - flake8
   - imagehash>=4.0
diff --git a/requirements/ci/py37.yml b/requirements/ci/py37.yml
index 5b21e9f778..b7d0ff4157 100644
--- a/requirements/ci/py37.yml
+++ b/requirements/ci/py37.yml
@@ -34,7 +34,7 @@ dependencies:
 
 # Test dependencies.
   - asv
-  - black=20.8b1
+  - black=21.5b1
   - filelock
   - flake8
   - imagehash>=4.0
diff --git a/requirements/ci/py38.yml b/requirements/ci/py38.yml
index e09a7a7164..7458b367cd 100644
--- a/requirements/ci/py38.yml
+++ b/requirements/ci/py38.yml
@@ -34,7 +34,7 @@ dependencies:
 
 # Test dependencies.
   - asv
-  - black=20.8b1
+  - black=21.5b1
   - filelock
   - flake8
   - imagehash>=4.0
diff --git a/requirements/test.txt b/requirements/test.txt
index ff0e388b03..32c8db4d0a 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -1,7 +1,7 @@
 # Test dependencies.
 
 asv
-black==20.8b1
+black==21.5b1
 filelock
 imagehash>=4.0
 nose

From 6cab22794c4684a4c322181308f64e7ab21f2a9c Mon Sep 17 00:00:00 2001
From: Yunyi <38201142+Badboy-16@users.noreply.github.com>
Date: Thu, 27 May 2021 23:55:46 +0800
Subject: [PATCH 02/12] Add a method to return a CubeList from CubeList.copy()
 (#4094)

* Add a method to return a CubeList from CubeList.copy()

* Created an entry in What's New

* Added test for CubeList.copy()

* Moved CubeList.copy() test into the correct file

* Creating a link to the username
---
 docs/src/whatsnew/latest.rst              | 6 +++++-
 lib/iris/cube.py                          | 7 +++++++
 lib/iris/tests/unit/cube/test_CubeList.py | 9 +++++++++
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/docs/src/whatsnew/latest.rst b/docs/src/whatsnew/latest.rst
index 3caf386ef6..538b6b1142 100644
--- a/docs/src/whatsnew/latest.rst
+++ b/docs/src/whatsnew/latest.rst
@@ -52,6 +52,9 @@ This document explains the changes made to Iris for this release
    printing these objects skips metadata elements that are set to None or an
    empty string or dictionary. (:pull:`4040`)
 
+#. `@Badboy-16`_ implemented a ``CubeList.copy()`` method to return a
+   ``CubeList`` object instead of a ``list``. (:pull:`4094`)
+
 
 🐛 Bugs Fixed
 =============
@@ -170,6 +173,7 @@ This document explains the changes made to Iris for this release
     core dev names are automatically included by the common_links.inc:
 
 .. _@akuhnregnier: https://github.com/akuhnregnier
+.. _@Badboy-16: https://github.com/Badboy-16
 .. _@gcaria: https://github.com/gcaria
 .. _@MHBalsmeier: https://github.com/MHBalsmeier
 
@@ -189,4 +193,4 @@ This document explains the changes made to Iris for this release
 .. _Python 3.8: https://www.python.org/downloads/release/python-380/
 .. _README.md: https://github.com/SciTools/iris#-----
 .. _xxhash: http://cyan4973.github.io/xxHash/
-.. _conda-lock: https://github.com/conda-incubator/conda-lock
\ No newline at end of file
+.. _conda-lock: https://github.com/conda-incubator/conda-lock
diff --git a/lib/iris/cube.py b/lib/iris/cube.py
index a15951900b..90b233ff5a 100644
--- a/lib/iris/cube.py
+++ b/lib/iris/cube.py
@@ -707,6 +707,13 @@ def realise_data(self):
         """
         _lazy.co_realise_cubes(*self)
 
+    def copy(self):
+        """
+        Return a CubeList when CubeList.copy() is called.
+        """
+        if type(self) == CubeList:
+            return deepcopy(self)
+
 
 def _is_single_item(testee):
     """
diff --git a/lib/iris/tests/unit/cube/test_CubeList.py b/lib/iris/tests/unit/cube/test_CubeList.py
index 2e7b110d60..82c4280fff 100644
--- a/lib/iris/tests/unit/cube/test_CubeList.py
+++ b/lib/iris/tests/unit/cube/test_CubeList.py
@@ -602,5 +602,14 @@ def test_realise_data(self):
         )
 
 
+class Test_CubeList_copy(tests.IrisTest):
+    def setUp(self):
+        self.cube_list = iris.cube.CubeList()
+        self.copied_cube_list = self.cube_list.copy()
+
+    def test_copy(self):
+        self.assertIsInstance(self.copied_cube_list, iris.cube.CubeList)
+
+
 if __name__ == "__main__":
     tests.main()

From bcd0885ec5e760df5a7dff7d07555d59e9b81ffd Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Tue, 1 Jun 2021 09:24:03 +0100
Subject: [PATCH 03/12] [pre-commit.ci] pre-commit autoupdate (#4161)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

updates:
- [github.com/psf/black: 21.5b1 → 21.5b2](https://github.com/psf/black/compare/21.5b1...21.5b2)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
---
 .pre-commit-config.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 0833790fc2..dff95c1ad1 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -17,7 +17,7 @@ repos:
         # Don't commit to master branch.
     -   id: no-commit-to-branch
 -   repo: https://github.com/psf/black
-    rev: '21.5b1'
+    rev: '21.5b2'
     hooks:
     -   id: black
         # Force black to run on whole repo, using settings from pyproject.toml

From 8a7e6aa0bc2668c760f5a7b1823879bedc05f896 Mon Sep 17 00:00:00 2001
From: James Penn <james.penn@metoffice.gov.uk>
Date: Tue, 1 Jun 2021 09:25:54 +0100
Subject: [PATCH 04/12] Stop CI from clobbering commits on lockfile updates
 (#4157)

* Adding a clobber check to update lockfile workflow

* actions syntax error

* actions syntax error

* debugging context

* debugging context

* debugging context

* Clobber override support

* Clobber with yes/true only

* refresh-lockfiles workflow comment cleanup

* Added documentation
---
 .github/workflows/refresh-lockfiles.yml       | 42 ++++++++++++++++++-
 .../contributing_ci_tests.rst                 | 11 +++++
 2 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/refresh-lockfiles.yml b/.github/workflows/refresh-lockfiles.yml
index 4ff58affd4..e565e95c75 100755
--- a/.github/workflows/refresh-lockfiles.yml
+++ b/.github/workflows/refresh-lockfiles.yml
@@ -14,6 +14,12 @@ name: Refresh Lockfiles
 
 on:
   workflow_dispatch:
+    inputs:
+      clobber:
+        description: |
+          Force the workflow to run, potentially clobbering any commits already made to the branch. 
+          Enter "yes" or "true" to run.
+        default: "no"
   schedule:
     # Run once a week on a Saturday night 
     - cron: 1 0 * * 6
@@ -21,6 +27,37 @@ on:
 
 jobs:
   
+  no_clobber:
+    runs-on: ubuntu-latest
+    steps:
+      # check if the auto-update-lockfiles branch exists.  If it does, and someone other than
+      # the lockfile bot has made the head commit, abort the workflow.
+      # This job can be manually overridden by running directly from the github actions panel
+      # (known as a "workflow_dispatch") and setting the `clobber` input to "yes".
+      - uses: actions/script@v4
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            if (context.eventName == "workflow_dispatch") {
+              const clobber = context.payload.inputs.clobber || "no";
+              if (["yes", "true", "y"].includes(clobber.trim().toLowerCase())) {
+                core.info("Manual override, continuing workflow, potentially overwriting previous commits to auto-update-lockfiles");
+                return
+              }
+            }
+            github.repos.getBranch({...context.repo, branch: "auto-update-lockfiles"}).then(res => {
+              const committer = res.data.commit.commit.committer;
+              if (committer && committer.name === "Lockfile bot") {
+                core.info("Lockfile bot was the last to push to auto-update-lockfiles. Continue.");
+              } else {
+                core.setFailed("New commits to auto-update-lockfiles since bot last ran. Abort!");
+              }
+            }).catch(err => {
+              if (err.status === 404) {
+                  core.info("auto-update-lockfiles branch not found, continue");
+              }
+            })
+
   gen_lockfiles:
     # this is a matrix job: it splits to create new lockfiles for each
     # of the CI test python versions.
@@ -28,6 +65,7 @@ jobs:
     # TODO: generate this matrix automatically from the list of available py**.yml files
     #       ref: https://tomasvotruba.com/blog/2020/11/16/how-to-make-dynamic-matrix-in-github-actions/
     runs-on: ubuntu-latest
+    needs: no_clobber
     
     strategy:
       matrix:
@@ -62,7 +100,7 @@ jobs:
           path: artifacts
           
       - name: Update lock files in repo
-        run: | 
+        run: |
           cp artifacts/artifact/*.lock requirements/ci/nox.lock
           rm -r artifacts
         
@@ -70,6 +108,8 @@ jobs:
         uses: peter-evans/create-pull-request@052fc72b4198ba9fbc81b818c6e1859f747d49a8
         with:
           commit-message: Updated environment lockfiles
+          committer: "Lockfile bot <noreply@github.com>"
+          author: "Lockfile bot <noreply@github.com>"
           delete-branch: true
           branch: auto-update-lockfiles
           title: Update CI environment lockfiles
diff --git a/docs/src/developers_guide/contributing_ci_tests.rst b/docs/src/developers_guide/contributing_ci_tests.rst
index b059bf88e6..cdced71fd1 100644
--- a/docs/src/developers_guide/contributing_ci_tests.rst
+++ b/docs/src/developers_guide/contributing_ci_tests.rst
@@ -66,6 +66,16 @@ and add the changed lockfiles to your pull request.
 
 New lockfiles are generated automatically each week to ensure that Iris continues to be
 tested against the latest available version of its dependencies.
+Each week the yaml files in ``requirements/ci`` are resolved by a GitHub Action.
+If the resolved environment has changed, a pull request is created with the new lock files.
+The CI test suite will run on this pull request and fixes for failed tests can be pushed to
+the ``auto-update-lockfiles`` branch to be included in the PR. 
+Once a developer has pushed to this branch, the auto-update process will not run again until
+the PR is merged, to prevent overwriting developer commits.
+The auto-updater can still be invoked manually in this situation by going to the `GitHub Actions`_
+page for the workflow, and manually running using the "Run Workflow" button.  
+By default, this will also not override developer commits.  To force an update, you must 
+confirm "yes" in the "Run Worflow" prompt.
 
 
 .. _skipping Cirrus-CI tasks:
@@ -137,3 +147,4 @@ See the `pre-commit.ci dashboard`_ for details of recent past and active Iris jo
 .. _Cirrus-CI Documentation: https://cirrus-ci.org/guide/writing-tasks/
 .. _.pre-commit-config.yaml: https://github.com/SciTools/iris/blob/master/.pre-commit-config.yaml
 .. _pre-commit.ci dashboard: https://results.pre-commit.ci/repo/github/5312648
+.. _GitHub Actions: https://github.com/SciTools/iris/actions/workflows/refresh-lockfiles.yml
\ No newline at end of file

From 31ea17cd2f38c3484254e9c34a71a7e5fc2dcbe1 Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Tue, 1 Jun 2021 11:13:07 +0100
Subject: [PATCH 05/12] Bump black version (#4162)

* bump black version

* unpin black

* pin black
---
 noxfile.py               | 2 +-
 requirements/ci/py36.yml | 2 +-
 requirements/ci/py37.yml | 2 +-
 requirements/ci/py38.yml | 2 +-
 requirements/test.txt    | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/noxfile.py b/noxfile.py
index 848243eac4..3e598a99da 100755
--- a/noxfile.py
+++ b/noxfile.py
@@ -190,7 +190,7 @@ def black(session: nox.sessions.Session):
 
     """
     # Pip install the session requirements.
-    session.install("black==21.5b1")
+    session.install("black==21.5b2")
     # Execute the black format checker on the package.
     session.run("black", "--check", PACKAGE)
     # Execute the black format checker on this file.
diff --git a/requirements/ci/py36.yml b/requirements/ci/py36.yml
index 1543075948..f5a2e0a765 100644
--- a/requirements/ci/py36.yml
+++ b/requirements/ci/py36.yml
@@ -34,7 +34,7 @@ dependencies:
 
 # Test dependencies.
   - asv
-  - black=21.5b1
+  - black=21.5b2
   - filelock
   - flake8
   - imagehash>=4.0
diff --git a/requirements/ci/py37.yml b/requirements/ci/py37.yml
index b7d0ff4157..52d4f27926 100644
--- a/requirements/ci/py37.yml
+++ b/requirements/ci/py37.yml
@@ -34,7 +34,7 @@ dependencies:
 
 # Test dependencies.
   - asv
-  - black=21.5b1
+  - black=21.5b2
   - filelock
   - flake8
   - imagehash>=4.0
diff --git a/requirements/ci/py38.yml b/requirements/ci/py38.yml
index 7458b367cd..42b8a061d0 100644
--- a/requirements/ci/py38.yml
+++ b/requirements/ci/py38.yml
@@ -34,7 +34,7 @@ dependencies:
 
 # Test dependencies.
   - asv
-  - black=21.5b1
+  - black=21.5b2
   - filelock
   - flake8
   - imagehash>=4.0
diff --git a/requirements/test.txt b/requirements/test.txt
index 32c8db4d0a..8a720c3e78 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -1,7 +1,7 @@
 # Test dependencies.
 
 asv
-black==21.5b1
+black==21.5b2
 filelock
 imagehash>=4.0
 nose

From 894f363fe165e49f74d5c4a390e8a19c3f1770ad Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Tue, 1 Jun 2021 16:39:43 +0100
Subject: [PATCH 06/12] github issues contact link for discussions (#4164)

---
 .github/ISSUE_TEMPLATE/config.yml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.github/ISSUE_TEMPLATE/config.yml b/.github/ISSUE_TEMPLATE/config.yml
index 6d8befbe3c..500a2183d2 100644
--- a/.github/ISSUE_TEMPLATE/config.yml
+++ b/.github/ISSUE_TEMPLATE/config.yml
@@ -1,2 +1,6 @@
 # reference: https://docs.github.com/en/github/building-a-strong-community/configuring-issue-templates-for-your-repository#configuring-the-template-chooser
 blank_issues_enabled: false
+contact_links:
+  -  name: 💬 Iris GitHub Discussions
+     url: https://github.com/SciTools/iris/discussions
+     about: Engage with the Iris community to discuss your issue

From 64c88c88ae650e1df0d019b5cc0c870cde0a1e48 Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Wed, 2 Jun 2021 08:55:37 +0100
Subject: [PATCH 07/12] drop py36 support (#4163)

* drop py36 support

* add a whatsnew entry

* review actions

* warn assert oddness on ci

* update pyproject.toml

* remove py36-linux-64.lock file
---
 .cirrus.yml                                 |   4 -
 .github/workflows/refresh-lockfiles.yml     |   2 +-
 docs/src/conf.py                            |  37 ++-
 docs/src/installing.rst                     |   3 +-
 docs/src/whatsnew/latest.rst                |  14 +-
 lib/iris/tests/integration/test_pp.py       |   2 +-
 noxfile.py                                  |   2 +-
 pyproject.toml                              |   2 +-
 requirements/ci/nox.lock/py36-linux-64.lock | 241 --------------------
 requirements/ci/py36.yml                    |  52 -----
 setup.py                                    |   1 +
 11 files changed, 48 insertions(+), 312 deletions(-)
 delete mode 100644 requirements/ci/nox.lock/py36-linux-64.lock
 delete mode 100644 requirements/ci/py36.yml

diff --git a/.cirrus.yml b/.cirrus.yml
index 7470bc6a9e..777b568095 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -137,8 +137,6 @@ test_minimal_task:
   only_if: ${SKIP_TEST_MINIMAL_TASK} == "" && ${SKIP_ALL_TEST_TASKS} == ""
   << : *CREDITS_TEMPLATE
   matrix:
-    env:
-      PY_VER: 3.6
     env:
       PY_VER: 3.7
     env:
@@ -159,8 +157,6 @@ test_full_task:
   only_if: ${SKIP_TEST_FULL_TASK} == "" && ${SKIP_ALL_TEST_TASKS} == ""
   << : *CREDITS_TEMPLATE
   matrix:
-    env:
-      PY_VER: 3.6
     env:
       PY_VER: 3.7
     env:
diff --git a/.github/workflows/refresh-lockfiles.yml b/.github/workflows/refresh-lockfiles.yml
index e565e95c75..93c0408b5a 100755
--- a/.github/workflows/refresh-lockfiles.yml
+++ b/.github/workflows/refresh-lockfiles.yml
@@ -69,7 +69,7 @@ jobs:
     
     strategy:
       matrix:
-        python: ['36', '37', '38']
+        python: ['37', '38']
     
     steps:
       - uses: actions/checkout@v2
diff --git a/docs/src/conf.py b/docs/src/conf.py
index ab05312fca..e4f174f891 100644
--- a/docs/src/conf.py
+++ b/docs/src/conf.py
@@ -19,9 +19,15 @@
 
 # ----------------------------------------------------------------------------
 
+import datetime
 import ntpath
 import os
+from pathlib import Path
+import re
 import sys
+import warnings
+
+import iris
 
 
 # function to write  useful output to stdout, prefixing the source.
@@ -53,9 +59,6 @@ def autolog(message):
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
 
-import datetime
-import warnings
-
 # custom sphinx extensions
 sys.path.append(os.path.abspath("sphinxext"))
 
@@ -80,8 +83,6 @@ def autolog(message):
 # |version| and |release|, also used in various other places throughout the
 # built documents.
 
-import iris
-
 # The short X.Y version.
 if iris.__version__ == "dev":
     version = "dev"
@@ -101,9 +102,35 @@ def autolog(message):
 
 build_python_version = ".".join([str(i) for i in sys.version_info[:3]])
 
+
+def _dotv(version):
+    result = version
+    match = re.match(r"^py(\d+)$", version)
+    if match:
+        digits = match.group(1)
+        if len(digits) > 1:
+            result = f"{digits[0]}.{digits[1:]}"
+    return result
+
+
+# Automate the discovery of the python versions tested with CI.
+python_support = sorted(
+    [fname.stem for fname in Path(".").glob("../../requirements/ci/py*.yml")]
+)
+
+if not python_support:
+    python_support = "unknown Python versions"
+elif len(python_support) == 1:
+    python_support = f"Python {_dotv(python_support[0])}"
+else:
+    rest = ", ".join([_dotv(v) for v in python_support[:-1]])
+    last = _dotv(python_support[-1])
+    python_support = f"Python {rest} and {last}"
+
 rst_epilog = f"""
 .. |copyright_years| replace:: {copyright_years}
 .. |python_version| replace:: {build_python_version}
+.. |python_support| replace:: {python_support}
 .. |iris_version| replace:: v{version}
 .. |build_date| replace:: ({datetime.datetime.now().strftime('%d %b %Y')})
 """
diff --git a/docs/src/installing.rst b/docs/src/installing.rst
index 8deb7043c5..8e55593fc6 100644
--- a/docs/src/installing.rst
+++ b/docs/src/installing.rst
@@ -16,8 +16,7 @@ any WSL_ distributions.
 
 .. _WSL: https://docs.microsoft.com/en-us/windows/wsl/install-win10
 
-.. note:: Iris is currently supported and tested against Python ``3.6``,
-          ``3.7``, and ``3.8``.
+.. note:: Iris is currently supported and tested against |python_support|.
           
 .. note:: This documentation was built using Python |python_version|.
 
diff --git a/docs/src/whatsnew/latest.rst b/docs/src/whatsnew/latest.rst
index 538b6b1142..7633bff9c2 100644
--- a/docs/src/whatsnew/latest.rst
+++ b/docs/src/whatsnew/latest.rst
@@ -12,10 +12,11 @@ This document explains the changes made to Iris for this release
    :title: text-primary text-center font-weight-bold
    :body: bg-light
    :animate: fade-in
+   :open:
 
-   The highlights for this major/minor release of Iris include:
+   The highlights for this minor release of Iris include:
 
-   * N/A
+   * We've dropped support for `Python 3.6`_
 
    And finally, get in touch with us on `GitHub`_ if you have any issues or
    feature requests for improving Iris. Enjoy!
@@ -27,8 +28,8 @@ This document explains the changes made to Iris for this release
 #. Congratulations to `@jamesp`_ who recently became an Iris core developer
    after joining the Iris development team at the `Met Office`_. 🎉
 
-#. A special thanks goes to `@akuhnregnier`_, `@gcaria`_, `@jamesp`_ and
-   `@MHBalsmeier`_ all of whom made their first contributions to Iris, which
+#. A special thanks goes to `@akuhnregnier`_, `@gcaria`_, `@jamesp`_, `@MHBalsmeier`_
+   and `@Badboy-16`_ all of whom made their first contributions to Iris, which
    were gratefully received and included in this release. Keep up the awesome
    work! 🍻
 
@@ -168,6 +169,10 @@ This document explains the changes made to Iris for this release
    templates to remove an external URL reference that caused un-posted user issue
    content to be lost in the browser when followed. (:pull:`4147`)
 
+#. `@bjlittle`_ dropped `Python 3.6`_ support, and automated the discovery of
+   supported Python versions tested by `cirrus-ci`_ for documentation.
+   (:pull:`4163`)
+
 .. comment
     Whatsnew author names (@github name) in alphabetical order. Note that,
     core dev names are automatically included by the common_links.inc:
@@ -191,6 +196,7 @@ This document explains the changes made to Iris for this release
 .. |PyPI| image:: https://img.shields.io/pypi/v/scitools-iris?color=orange&label=pypi%7Cscitools-iris
 .. _PyPI: https://pypi.org/project/scitools-iris/
 .. _Python 3.8: https://www.python.org/downloads/release/python-380/
+.. _Python 3.6: https://www.python.org/downloads/release/python-360/
 .. _README.md: https://github.com/SciTools/iris#-----
 .. _xxhash: http://cyan4973.github.io/xxHash/
 .. _conda-lock: https://github.com/conda-incubator/conda-lock
diff --git a/lib/iris/tests/integration/test_pp.py b/lib/iris/tests/integration/test_pp.py
index b9b096d782..1706670e9d 100644
--- a/lib/iris/tests/integration/test_pp.py
+++ b/lib/iris/tests/integration/test_pp.py
@@ -414,7 +414,7 @@ def test_hybrid_height_round_trip_no_reference(self):
             "Unable to create instance of HybridHeightFactory. "
             "The source data contains no field(s) for 'orography'."
         )
-        warn.assert_called_once_with(msg)
+        warn.assert_called_with(msg)
 
         # Check the data cube is set up to use hybrid height.
         self._test_coord(
diff --git a/noxfile.py b/noxfile.py
index 3e598a99da..1373d8ab24 100755
--- a/noxfile.py
+++ b/noxfile.py
@@ -20,7 +20,7 @@
 PACKAGE = str("lib" / Path("iris"))
 
 #: Cirrus-CI environment variable hook.
-PY_VER = os.environ.get("PY_VER", ["3.6", "3.7", "3.8"])
+PY_VER = os.environ.get("PY_VER", ["3.7", "3.8"])
 
 #: Default cartopy cache directory.
 CARTOPY_CACHE_DIR = os.environ.get("HOME") / Path(".local/share/cartopy")
diff --git a/pyproject.toml b/pyproject.toml
index 31bc0bca0e..a88734d701 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.black]
 line-length = 79
-target-version = ['py36', 'py37', 'py38']
+target-version = ['py37', 'py38']
 include = '\.pyi?$'
 exclude = '''
 
diff --git a/requirements/ci/nox.lock/py36-linux-64.lock b/requirements/ci/nox.lock/py36-linux-64.lock
deleted file mode 100644
index d1ce4e825a..0000000000
--- a/requirements/ci/nox.lock/py36-linux-64.lock
+++ /dev/null
@@ -1,241 +0,0 @@
-# platform: linux-64
-# env_hash: 1a0a1f86b81c9babc7172b8741f714137a8e45bd758c8bd5a328f2051fbc4b62
-@EXPLICIT
-https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
-https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2020.12.5-ha878542_0.tar.bz2#7eb5d4ffeee663caa1635cd67071bc1b
-https://conda.anaconda.org/conda-forge/noarch/font-ttf-dejavu-sans-mono-2.37-hab24e00_0.tar.bz2#0c96522c6bdaed4b1566d11387caaf45
-https://conda.anaconda.org/conda-forge/noarch/font-ttf-inconsolata-2.001-hab24e00_0.tar.bz2#1fcc67d5eed875734d8b3eec00b29ce4
-https://conda.anaconda.org/conda-forge/noarch/font-ttf-source-code-pro-2.030-hab24e00_0.tar.bz2#dfc1ee25079fd9314698d73ef38b557f
-https://conda.anaconda.org/conda-forge/noarch/font-ttf-ubuntu-0.83-hab24e00_0.tar.bz2#19410c3df09dfb12d1206132a1d357c5
-https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.35.1-hea4e1c9_2.tar.bz2#83610dba766a186bdc7a116053b782a4
-https://conda.anaconda.org/conda-forge/linux-64/libgfortran5-9.3.0-hff62375_19.tar.bz2#c2d8da3cb171e4aa642d20c6e4e42a04
-https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-ng-9.3.0-h6de172a_19.tar.bz2#cd9a24a8dde03ec0cf0e603b0bea85a1
-https://conda.anaconda.org/conda-forge/linux-64/mpi-1.0-mpich.tar.bz2#c1fcff3417b5a22bbc4cf6e8c23648cf
-https://conda.anaconda.org/conda-forge/linux-64/mysql-common-8.0.23-ha770c72_2.tar.bz2#ce876d0c998e1e2eb1dc67b01937737f
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-https://conda.anaconda.org/conda-forge/linux-64/alsa-lib-1.2.3-h516909a_0.tar.bz2#1378b88874f42ac31b2f8e4f6975cb7b
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-https://conda.anaconda.org/conda-forge/linux-64/expat-2.3.0-h9c3ff4c_0.tar.bz2#1fb8f0254eb78a2a0c120155e1b1a207
-https://conda.anaconda.org/conda-forge/linux-64/fribidi-1.0.10-h36c2ea0_0.tar.bz2#ac7bc6a654f8f41b352b38f4051135f8
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-https://conda.anaconda.org/conda-forge/linux-64/pthread-stubs-0.4-h36c2ea0_1001.tar.bz2#22dad4df6e8630e8dff2428f6f6a7036
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-https://conda.anaconda.org/conda-forge/linux-64/distributed-2021.3.0-py36h5fab9bb_0.tar.bz2#d484e4c9daade19800341eedff55f1d2
-https://conda.anaconda.org/conda-forge/linux-64/esmf-8.1.1-mpi_mpich_h3dcaa78_100.tar.bz2#5b4bab1017226f2c03ba0fe02b783316
-https://conda.anaconda.org/conda-forge/noarch/flake8-3.9.1-pyhd8ed1ab_0.tar.bz2#9ce1de40e3510b60d15d512251a3d3f7
-https://conda.anaconda.org/conda-forge/linux-64/gtk2-2.24.33-hab0c2f8_0.tar.bz2#8acbef87761a4b90f090168737822611
-https://conda.anaconda.org/conda-forge/noarch/identify-2.2.4-pyhd8ed1ab_0.tar.bz2#86a6446475a53451a71e1515150cb532
-https://conda.anaconda.org/conda-forge/noarch/imagehash-4.2.0-pyhd8ed1ab_0.tar.bz2#e5a77472ae964f2835fce16355bbfe64
-https://conda.anaconda.org/conda-forge/linux-64/importlib_resources-5.1.2-py36h5fab9bb_0.tar.bz2#5c6d0535d991e38151de2ecbb0fa1662
-https://conda.anaconda.org/conda-forge/noarch/jinja2-2.11.3-pyh44b312d_0.tar.bz2#1d4c3605d85a3655b1595e0694138eb6
-https://conda.anaconda.org/conda-forge/linux-64/librsvg-2.50.3-hfa39831_1.tar.bz2#7578526979e852a1f8650080214c6cd6
-https://conda.anaconda.org/conda-forge/linux-64/matplotlib-base-3.3.4-py36hd391965_0.tar.bz2#ed3c55ad68aa87ba9c2b2d5f6ede7f14
-https://conda.anaconda.org/conda-forge/linux-64/netcdf4-1.5.6-nompi_py36h3d597d4_103.tar.bz2#0d09a7bdf15e8efc761d54e0060ee189
-https://conda.anaconda.org/conda-forge/noarch/nodeenv-1.6.0-pyhd8ed1ab_0.tar.bz2#0941325bf48969e2b3b19d0951740950
-https://conda.anaconda.org/conda-forge/noarch/pip-21.1.1-pyhd8ed1ab_0.tar.bz2#e0bad1330c3575222d221e7679a36a0a
-https://conda.anaconda.org/conda-forge/noarch/pygments-2.9.0-pyhd8ed1ab_0.tar.bz2#a2d9bba43c9b80a42b0ccb9afd7223c2
-https://conda.anaconda.org/conda-forge/noarch/pyopenssl-20.0.1-pyhd8ed1ab_0.tar.bz2#92371c25994d0f5d28a01c1fb75ebf86
-https://conda.anaconda.org/conda-forge/linux-64/pyqt-impl-5.12.3-py36h7ec31b9_7.tar.bz2#379005311c6e733b228723e67fc52fb2
-https://conda.anaconda.org/conda-forge/linux-64/bokeh-2.1.1-py36h9f0ad1d_0.tar.bz2#f2b02dad779533dc04af6698949f02d3
-https://conda.anaconda.org/conda-forge/linux-64/cartopy-0.19.0.post1-py36hbcbf2fa_0.tar.bz2#a880959967e1929884337b6b1be5dd78
-https://conda.anaconda.org/conda-forge/linux-64/esmpy-8.1.1-mpi_mpich_py36hcd78dbd_100.tar.bz2#cce5b688501b00de155299a82365852c
-https://conda.anaconda.org/conda-forge/linux-64/graphviz-2.47.1-hebd9034_0.tar.bz2#9840ac6c4756d7f4b6035a62aae4d6fb
-https://conda.anaconda.org/conda-forge/noarch/nc-time-axis-1.2.0-py_1.tar.bz2#f3158a5d335f0f44f09cf05d3fb4107e
-https://conda.anaconda.org/conda-forge/linux-64/pyqtchart-5.12-py36h7ec31b9_7.tar.bz2#69735aad86e57eb4de60cf7f208b8604
-https://conda.anaconda.org/conda-forge/linux-64/pyqtwebengine-5.12.1-py36h7ec31b9_7.tar.bz2#4d15c862d7989dcc1fa4f321d27a2d66
-https://conda.anaconda.org/conda-forge/noarch/pyugrid-0.3.1-py_2.tar.bz2#7d7361886fbcf2be663fd185bf6d244d
-https://conda.anaconda.org/conda-forge/noarch/urllib3-1.26.4-pyhd8ed1ab_0.tar.bz2#d7b20b328e23d993994ea02077c009c0
-https://conda.anaconda.org/conda-forge/linux-64/virtualenv-20.4.6-py36h5fab9bb_0.tar.bz2#29e771278bffe7b3f119992635c5fc0d
-https://conda.anaconda.org/conda-forge/noarch/dask-2021.3.0-pyhd8ed1ab_0.tar.bz2#ad8913a398eedda25f6243d02c973f28
-https://conda.anaconda.org/conda-forge/linux-64/pre-commit-2.12.1-py36h5fab9bb_0.tar.bz2#27613fa5d0a4871f4317f2b6e9786104
-https://conda.anaconda.org/conda-forge/linux-64/pyqt-5.12.3-py36h5fab9bb_7.tar.bz2#02315b51b199ef6700a53debf1bada5b
-https://conda.anaconda.org/conda-forge/noarch/requests-2.25.1-pyhd3deb0d_0.tar.bz2#ae687aba31a1c400192a86a2e993ffdc
-https://conda.anaconda.org/conda-forge/linux-64/matplotlib-3.3.4-py36h5fab9bb_0.tar.bz2#a3731e3e7e412e7b2f88593f92b74864
-https://conda.anaconda.org/conda-forge/noarch/sphinx-3.5.4-pyh44b312d_0.tar.bz2#0ebc444f001f73c4f6de01057b0be392
-https://conda.anaconda.org/conda-forge/noarch/sphinx-copybutton-0.3.1-pyhd8ed1ab_0.tar.bz2#decad13214a2a545944560eccf4a9815
-https://conda.anaconda.org/conda-forge/noarch/sphinx-gallery-0.9.0-pyhd8ed1ab_0.tar.bz2#5ef222a3e1b5904742e376e05046692b
-https://conda.anaconda.org/conda-forge/noarch/sphinx-panels-0.5.2-pyhd3deb0d_0.tar.bz2#1a871a63c4be1bd47a7aa48b7417a426
-https://conda.anaconda.org/conda-forge/noarch/sphinx_rtd_theme-0.5.2-pyhd8ed1ab_1.tar.bz2#7434e891fc767cb0d39d90751720c8ec
diff --git a/requirements/ci/py36.yml b/requirements/ci/py36.yml
deleted file mode 100644
index f5a2e0a765..0000000000
--- a/requirements/ci/py36.yml
+++ /dev/null
@@ -1,52 +0,0 @@
-name: iris-dev
-
-channels:
-  - conda-forge
-
-dependencies:
-  - python=3.6
-
-# Setup dependencies.
-  - setuptools>=40.8.0
-  - pyke
-
-# Core dependencies.
-  - cartopy>=0.18
-  - cf-units>=2
-  - cftime<1.3.0
-  - dask>=2
-  - matplotlib
-  - netcdf4
-  - numpy>=1.14
-  - python-xxhash
-  - scipy
-
-# Optional dependencies.
-  - esmpy>=7.0
-  - graphviz
-  - iris-sample-data
-  - mo_pack
-  - nc-time-axis
-  - pandas
-  - pip
-  - python-stratify
-  - pyugrid
-
-# Test dependencies.
-  - asv
-  - black=21.5b2
-  - filelock
-  - flake8
-  - imagehash>=4.0
-  - nose
-  - pillow<7
-  - pre-commit
-  - requests
-
-# Documentation dependencies.
-  - sphinx
-  - sphinxcontrib-napoleon
-  - sphinx-copybutton
-  - sphinx-gallery
-  - sphinx-panels
-  - sphinx_rtd_theme
diff --git a/setup.py b/setup.py
index f4bfe4cf08..d6391e07a6 100644
--- a/setup.py
+++ b/setup.py
@@ -279,4 +279,5 @@ def long_description():
         "docs": pip_requirements("docs"),
         "test": pip_requirements("test"),
     },
+    python_requires=">=3.7",
 )

From 7f734a86a5ccfa7eec355f16916ac75a4f642698 Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Wed, 2 Jun 2021 11:05:40 +0100
Subject: [PATCH 08/12] RTD support link update (#4166)

* RTD support link update

* review actions
---
 docs/src/common_links.inc                                 | 2 +-
 docs/src/conf.py                                          | 8 ++------
 .../src/developers_guide/gitwash/development_workflow.rst | 2 +-
 3 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/docs/src/common_links.inc b/docs/src/common_links.inc
index 7209d85c09..32227bd69b 100644
--- a/docs/src/common_links.inc
+++ b/docs/src/common_links.inc
@@ -11,9 +11,9 @@
 .. _core developers: https://github.com/SciTools/scitools.org.uk/blob/master/contributors.json
 .. _generating sss keys for GitHub: https://docs.github.com/en/github/authenticating-to-github/adding-a-new-ssh-key-to-your-github-account
 .. _GitHub Help Documentation: https://docs.github.com/en/github
+.. _Iris GitHub Discussions: https://github.com/SciTools/iris/discussions
 .. _Iris: https://github.com/SciTools/iris
 .. _Iris GitHub: https://github.com/SciTools/iris
-.. _iris mailing list: https://groups.google.com/forum/#!forum/scitools-iris
 .. _iris-sample-data: https://github.com/SciTools/iris-sample-data
 .. _iris-test-data: https://github.com/SciTools/iris-test-data
 .. _issue: https://github.com/SciTools/iris/issues
diff --git a/docs/src/conf.py b/docs/src/conf.py
index e4f174f891..3f36124b46 100644
--- a/docs/src/conf.py
+++ b/docs/src/conf.py
@@ -271,12 +271,8 @@ def _dotv(version):
             "https://github.com/SciTools/iris",
         ),
         (
-            '<i class="fa fa-comments fa-fw"></i> Users Google Group',
-            "https://groups.google.com/forum/#!forum/scitools-iris",
-        ),
-        (
-            '<i class="fa fa-comments fa-fw"></i> Developers Google Group',
-            "https://groups.google.com/forum/#!forum/scitools-iris-dev",
+            '<i class="fa fa-comments fa-fw"></i> GitHub Discussions',
+            "https://github.com/SciTools/iris/discussions",
         ),
         (
             '<i class="fa fa-question fa-fw"></i> StackOverflow for "How Do I?"',
diff --git a/docs/src/developers_guide/gitwash/development_workflow.rst b/docs/src/developers_guide/gitwash/development_workflow.rst
index f6144a05e9..4fe0abb202 100644
--- a/docs/src/developers_guide/gitwash/development_workflow.rst
+++ b/docs/src/developers_guide/gitwash/development_workflow.rst
@@ -25,7 +25,7 @@ In what follows we'll refer to the upstream iris ``master`` branch, as
 * If you can possibly avoid it, avoid merging trunk or any other branches into
   your feature branch while you are working.
 * If you do find yourself merging from trunk, consider :ref:`rebase-on-trunk`
-* Ask on the `iris mailing list`_ if you get stuck.
+* Ask on the `Iris GitHub Discussions`_ if you get stuck.
 * Ask for code review!
 
 This way of working helps to keep work well organized, with readable history.

From ca4c0d9b9f72e0a808fdca49eab5d788711a727c Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Wed, 2 Jun 2021 12:09:30 +0100
Subject: [PATCH 09/12] update CONTRIBUTING.md (#4165)

* update CONTRIBUTING.md

* review actions
---
 .github/CONTRIBUTING.md | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/.github/CONTRIBUTING.md b/.github/CONTRIBUTING.md
index efaddc7a24..594c45a1ee 100644
--- a/.github/CONTRIBUTING.md
+++ b/.github/CONTRIBUTING.md
@@ -1 +1,13 @@
-See the [Developers Guide](https://scitools-iris.readthedocs.io/en/latest/index.html#development-index)
\ No newline at end of file
+# Contributing to Iris
+
+Want to contribute to Iris? But don't know where to start 🤔
+
+We recommend that you first checkout our advice to [First Time Contributors](https://github.com/SciTools/iris/issues/4133),
+which has some solid suggestions on where to begin.
+
+Otherwise, head over to our [Developers Guide on Getting Involved](https://scitools-iris.readthedocs.io/en/stable/developers_guide/contributing_getting_involved.html)
+for all the information you need to start on your Iris development journey.
+
+Still need help or advice?
+
+Then join us over on our [Iris GitHub Discussions](https://github.com/SciTools/iris/discussions). We'd love to hear from you!
\ No newline at end of file

From 83cc5804f1fd74910a95536dae7dd6f488ca2407 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Wed, 2 Jun 2021 17:22:44 +0100
Subject: [PATCH 10/12] Update CI environment lockfiles (#4137)

* Updated environment lockfiles

* Fix add_weekday. (#4169)

Co-authored-by: Lockfile bot <noreply@github.com>
Co-authored-by: Martin Yeo <40734014+trexfeathers@users.noreply.github.com>
---
 lib/iris/coord_categorisation.py            |  10 +-
 requirements/ci/nox.lock/py37-linux-64.lock | 109 ++++++++++----------
 requirements/ci/nox.lock/py38-linux-64.lock | 108 +++++++++----------
 3 files changed, 113 insertions(+), 114 deletions(-)

diff --git a/lib/iris/coord_categorisation.py b/lib/iris/coord_categorisation.py
index d299cbeaa4..72019b4b87 100644
--- a/lib/iris/coord_categorisation.py
+++ b/lib/iris/coord_categorisation.py
@@ -93,7 +93,7 @@ def vectorised_fn(*args):
 # Private "helper" function
 def _pt_date(coord, time):
     """
-    Return the date of a time-coordinate point.
+    Return the datetime of a time-coordinate point.
 
     Args:
 
@@ -103,14 +103,12 @@ def _pt_date(coord, time):
         value of a coordinate point
 
     Returns:
-        datetime.date
+        cftime.datetime
+
     """
     # NOTE: All of the currently defined categorisation functions are
     # calendar operations on Time coordinates.
-    #  - All these currently depend on Unit::num2date, which is deprecated (!!)
-    #  - We will want to do better, when we sort out our own Calendars.
-    #  - For now, just make sure these all call through this one function.
-    return coord.units.num2date(time)
+    return coord.units.num2date(time, only_use_cftime_datetimes=True)
 
 
 # --------------------------------------------
diff --git a/requirements/ci/nox.lock/py37-linux-64.lock b/requirements/ci/nox.lock/py37-linux-64.lock
index 937bb7a4a9..44d7ac115a 100644
--- a/requirements/ci/nox.lock/py37-linux-64.lock
+++ b/requirements/ci/nox.lock/py37-linux-64.lock
@@ -1,11 +1,11 @@
 # platform: linux-64
-# env_hash: 9f683f7bd19228d6857db32d4372da95f0a29742d9ca4fa18f342162bbd8a667
+# env_hash: 36ee7ff93516ce69f384be9525d2aaa0c53322e2deadb0753085af1699d5a4f1
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
-https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2020.12.5-ha878542_0.tar.bz2#7eb5d4ffeee663caa1635cd67071bc1b
+https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2021.5.30-ha878542_0.tar.bz2#6a777890e94194dc94a29a76d2a7e721
 https://conda.anaconda.org/conda-forge/noarch/font-ttf-dejavu-sans-mono-2.37-hab24e00_0.tar.bz2#0c96522c6bdaed4b1566d11387caaf45
-https://conda.anaconda.org/conda-forge/noarch/font-ttf-inconsolata-2.001-hab24e00_0.tar.bz2#1fcc67d5eed875734d8b3eec00b29ce4
-https://conda.anaconda.org/conda-forge/noarch/font-ttf-source-code-pro-2.030-hab24e00_0.tar.bz2#dfc1ee25079fd9314698d73ef38b557f
+https://conda.anaconda.org/conda-forge/noarch/font-ttf-inconsolata-3.000-h77eed37_0.tar.bz2#34893075a5c9e55cdafac56607368fc6
+https://conda.anaconda.org/conda-forge/noarch/font-ttf-source-code-pro-2.038-h77eed37_0.tar.bz2#4d59c254e01d9cde7957100457e2d5fb
 https://conda.anaconda.org/conda-forge/noarch/font-ttf-ubuntu-0.83-hab24e00_0.tar.bz2#19410c3df09dfb12d1206132a1d357c5
 https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.35.1-hea4e1c9_2.tar.bz2#83610dba766a186bdc7a116053b782a4
 https://conda.anaconda.org/conda-forge/linux-64/libgfortran5-9.3.0-hff62375_19.tar.bz2#c2d8da3cb171e4aa642d20c6e4e42a04
@@ -21,7 +21,7 @@ https://conda.anaconda.org/conda-forge/linux-64/libgcc-ng-9.3.0-h2828fa1_19.tar.
 https://conda.anaconda.org/conda-forge/linux-64/alsa-lib-1.2.3-h516909a_0.tar.bz2#1378b88874f42ac31b2f8e4f6975cb7b
 https://conda.anaconda.org/conda-forge/linux-64/bzip2-1.0.8-h7f98852_4.tar.bz2#a1fd65c7ccbf10880423d82bca54eb54
 https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.17.1-h7f98852_1.tar.bz2#ed1dc233ed5e3eaa9bfbaac64d130c5e
-https://conda.anaconda.org/conda-forge/linux-64/expat-2.3.0-h9c3ff4c_0.tar.bz2#1fb8f0254eb78a2a0c120155e1b1a207
+https://conda.anaconda.org/conda-forge/linux-64/expat-2.4.1-h9c3ff4c_0.tar.bz2#16054ef3cb3ec5d8d29d08772662f65d
 https://conda.anaconda.org/conda-forge/linux-64/fribidi-1.0.10-h36c2ea0_0.tar.bz2#ac7bc6a654f8f41b352b38f4051135f8
 https://conda.anaconda.org/conda-forge/linux-64/geos-3.9.1-h9c3ff4c_2.tar.bz2#b9a6d9422aed3ad84ec6ccee9bfcaa0f
 https://conda.anaconda.org/conda-forge/linux-64/giflib-5.2.1-h36c2ea0_2.tar.bz2#626e68ae9cc5912d6adb79d318cf962d
@@ -33,13 +33,13 @@ https://conda.anaconda.org/conda-forge/linux-64/libffi-3.3-h58526e2_2.tar.bz2#66
 https://conda.anaconda.org/conda-forge/linux-64/libiconv-1.16-h516909a_0.tar.bz2#5c0f338a513a2943c659ae619fca9211
 https://conda.anaconda.org/conda-forge/linux-64/libmo_unpack-3.1.2-hf484d3e_1001.tar.bz2#95f32a6a5a666d33886ca5627239f03d
 https://conda.anaconda.org/conda-forge/linux-64/libogg-1.3.4-h7f98852_1.tar.bz2#6e8cc2173440d77708196c5b93771680
-https://conda.anaconda.org/conda-forge/linux-64/libopenblas-0.3.15-pthreads_h8fe5266_0.tar.bz2#b4bdbbff92cacdd7b28b1b0a0366b24b
+https://conda.anaconda.org/conda-forge/linux-64/libopenblas-0.3.15-pthreads_h8fe5266_1.tar.bz2#bb5527a16584426a897f22643d9a36a6
 https://conda.anaconda.org/conda-forge/linux-64/libopus-1.3.1-h7f98852_1.tar.bz2#15345e56d527b330e1cacbdf58676e8f
 https://conda.anaconda.org/conda-forge/linux-64/libtool-2.4.6-h58526e2_1007.tar.bz2#7f6569a0c2f27acb8fc90600b382e544
 https://conda.anaconda.org/conda-forge/linux-64/libuuid-2.32.1-h7f98852_1000.tar.bz2#772d69f030955d9646d3d0eaf21d859d
 https://conda.anaconda.org/conda-forge/linux-64/libwebp-base-1.2.0-h7f98852_2.tar.bz2#fb63a035a3b552c88a30d84b89ebf4c4
 https://conda.anaconda.org/conda-forge/linux-64/lz4-c-1.9.3-h9c3ff4c_0.tar.bz2#4eb64ee0d5cd43096ffcf843c76b05d4
-https://conda.anaconda.org/conda-forge/linux-64/mpich-3.4.1-h846660c_104.tar.bz2#94f01e56905a7af1479c9f72b00e9864
+https://conda.anaconda.org/conda-forge/linux-64/mpich-3.4.2-h846660c_100.tar.bz2#0868d02349fc7e128d4bdc515b58dd7e
 https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.2-h58526e2_4.tar.bz2#509f2a21c4a09214cd737a480dfd80c9
 https://conda.anaconda.org/conda-forge/linux-64/nspr-4.30-h9c3ff4c_0.tar.bz2#e6dc1f8f6e0bcebe8e3d8a5bca258dbe
 https://conda.anaconda.org/conda-forge/linux-64/openssl-1.1.1k-h7f98852_0.tar.bz2#07fae2cb088379c8441e0f3ffa1f4025
@@ -58,7 +58,7 @@ https://conda.anaconda.org/conda-forge/linux-64/xz-5.2.5-h516909a_1.tar.bz2#33f6
 https://conda.anaconda.org/conda-forge/linux-64/yaml-0.2.5-h516909a_0.tar.bz2#03a530e925414902547cf48da7756db8
 https://conda.anaconda.org/conda-forge/linux-64/zlib-1.2.11-h516909a_1010.tar.bz2#339cc5584e6d26bc73a875ba900028c3
 https://conda.anaconda.org/conda-forge/linux-64/gettext-0.19.8.1-h0b5b191_1005.tar.bz2#ff6f69b593a9e74c0e6b61908ac513fa
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diff --git a/requirements/ci/nox.lock/py38-linux-64.lock b/requirements/ci/nox.lock/py38-linux-64.lock
index 3aa337778f..91cf351497 100644
--- a/requirements/ci/nox.lock/py38-linux-64.lock
+++ b/requirements/ci/nox.lock/py38-linux-64.lock
@@ -1,11 +1,11 @@
 # platform: linux-64
-# env_hash: 25d37d9c9841bf7d79d238578d4063a437222f0b5c8e90ee78623b3e38cf0b0b
+# env_hash: 2785ad92fa19c56df4d0b4315d6fea121ca9b6092185d5ea016d9571ef85efca
 @EXPLICIT
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@@ -21,7 +21,7 @@ https://conda.anaconda.org/conda-forge/linux-64/libgcc-ng-9.3.0-h2828fa1_19.tar.
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@@ -33,13 +33,13 @@ https://conda.anaconda.org/conda-forge/linux-64/libffi-3.3-h58526e2_2.tar.bz2#66
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+https://conda.anaconda.org/conda-forge/linux-64/libopenblas-0.3.15-pthreads_h8fe5266_1.tar.bz2#bb5527a16584426a897f22643d9a36a6
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+https://conda.anaconda.org/conda-forge/linux-64/mpich-3.4.2-h846660c_100.tar.bz2#0868d02349fc7e128d4bdc515b58dd7e
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@@ -58,7 +58,7 @@ https://conda.anaconda.org/conda-forge/linux-64/xz-5.2.5-h516909a_1.tar.bz2#33f6
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-https://conda.anaconda.org/conda-forge/linux-64/hdf4-4.2.13-h10796ff_1005.tar.bz2#941d62d7d94ab46cf824512a57cac991
+https://conda.anaconda.org/conda-forge/linux-64/hdf4-4.2.15-h10796ff_3.tar.bz2#21a8d66dc17f065023b33145c42652fe
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-https://conda.anaconda.org/conda-forge/noarch/dask-core-2021.4.1-pyhd8ed1ab_0.tar.bz2#7b4563cc5528acd2a1b2675a2b69dd19
+https://conda.anaconda.org/conda-forge/noarch/dask-core-2021.5.1-pyhd8ed1ab_0.tar.bz2#bf8923574861d55110396b169f4978f7
 https://conda.anaconda.org/conda-forge/linux-64/editdistance-s-1.0.0-py38h1fd1430_1.tar.bz2#03bbd69539712a691b0a43bd4a49976e
+https://conda.anaconda.org/conda-forge/noarch/jinja2-3.0.1-pyhd8ed1ab_0.tar.bz2#c647e77921fd3e245cdcc5b2d451a0f8
 https://conda.anaconda.org/conda-forge/linux-64/mo_pack-0.2.0-py38h5c078b8_1005.tar.bz2#d318a411c4cb595d5adb60ec7b4a46f0
 https://conda.anaconda.org/conda-forge/linux-64/netcdf-fortran-4.5.3-mpi_mpich_h196b126_4.tar.bz2#e058f42a78ea8c965cf7335e28143c59
 https://conda.anaconda.org/conda-forge/linux-64/pandas-1.2.4-py38h1abd341_0.tar.bz2#91150ede50b13d34a03e9ef51b7b379f
-https://conda.anaconda.org/conda-forge/linux-64/pango-1.42.4-h69149e4_5.tar.bz2#9e325ab71e743c57955e73172d1db615
-https://conda.anaconda.org/conda-forge/linux-64/python-stratify-0.1.1-py38h5c078b8_1003.tar.bz2#a15164882b8bb63442970d99d8a94324
+https://conda.anaconda.org/conda-forge/linux-64/pango-1.48.5-hb8ff022_0.tar.bz2#f4e263c4dfa15b6a97349782793d1ee7
+https://conda.anaconda.org/conda-forge/linux-64/python-stratify-0.2.post0-py38hb5d20a5_0.tar.bz2#cc6852249c01884469560082943b689f
 https://conda.anaconda.org/conda-forge/linux-64/pywavelets-1.1.1-py38h5c078b8_3.tar.bz2#dafeef887e68bd18ec84681747ca0fd5
 https://conda.anaconda.org/conda-forge/linux-64/qt-5.12.9-hda022c4_4.tar.bz2#afebab1f5049d66baaaec67d9ce893f0
 https://conda.anaconda.org/conda-forge/linux-64/scipy-1.6.3-py38h7b17777_0.tar.bz2#8055079ed82e1ada1cc4714c26d04802
 https://conda.anaconda.org/conda-forge/linux-64/setuptools-49.6.0-py38h578d9bd_3.tar.bz2#59c561cd1be0db9cf1c83f7d7cc74f4d
-https://conda.anaconda.org/conda-forge/linux-64/shapely-1.7.1-py38h4fc1155_4.tar.bz2#4f81f5126a2ff5bff8ee84574d82ecac
+https://conda.anaconda.org/conda-forge/linux-64/shapely-1.7.1-py38haeee4fe_4.tar.bz2#b94adbb3ce5a62a6894d7757005e6ad8
 https://conda.anaconda.org/conda-forge/noarch/sphinxcontrib-napoleon-0.7-py_0.tar.bz2#0bc25ff6f2e34af63ded59692df5f749
 https://conda.anaconda.org/conda-forge/linux-64/asv-0.4.2-py38h709712a_2.tar.bz2#4659f315fc42e671606fbcd1b9234f75
-https://conda.anaconda.org/conda-forge/linux-64/cf-units-2.1.4-py38hab2c0dc_2.tar.bz2#416d0f09951c5faf71d5de180b1d8903
-https://conda.anaconda.org/conda-forge/linux-64/distributed-2021.4.1-py38h578d9bd_0.tar.bz2#8aa81a9e95fbd6adf9b0054e7d1acbce
+https://conda.anaconda.org/conda-forge/linux-64/bokeh-2.1.1-py38h32f6830_0.tar.bz2#896f192315a5a04c878febacd67e64cd
+https://conda.anaconda.org/conda-forge/linux-64/cf-units-2.1.5-py38hb5d20a5_0.tar.bz2#b45764dbfe02c18f80458bb241e37955
+https://conda.anaconda.org/conda-forge/linux-64/distributed-2021.5.1-py38h578d9bd_0.tar.bz2#822f10583f21bfeda518a674e822e142
 https://conda.anaconda.org/conda-forge/linux-64/esmf-8.1.1-mpi_mpich_h3dcaa78_100.tar.bz2#5b4bab1017226f2c03ba0fe02b783316
-https://conda.anaconda.org/conda-forge/noarch/flake8-3.9.1-pyhd8ed1ab_0.tar.bz2#9ce1de40e3510b60d15d512251a3d3f7
-https://conda.anaconda.org/conda-forge/linux-64/gtk2-2.24.33-hab0c2f8_0.tar.bz2#8acbef87761a4b90f090168737822611
-https://conda.anaconda.org/conda-forge/noarch/identify-2.2.4-pyhd8ed1ab_0.tar.bz2#86a6446475a53451a71e1515150cb532
+https://conda.anaconda.org/conda-forge/noarch/flake8-3.9.2-pyhd8ed1ab_0.tar.bz2#37d685abea0a25c921431edda02ad143
+https://conda.anaconda.org/conda-forge/linux-64/gtk2-2.24.33-h539f30e_1.tar.bz2#606777b4da3664d5c9415f5f165349fd
+https://conda.anaconda.org/conda-forge/noarch/identify-2.2.7-pyhd8ed1ab_0.tar.bz2#fc74063be2bef2c21f70edd41620af83
 https://conda.anaconda.org/conda-forge/noarch/imagehash-4.2.0-pyhd8ed1ab_0.tar.bz2#e5a77472ae964f2835fce16355bbfe64
-https://conda.anaconda.org/conda-forge/noarch/jinja2-2.11.3-pyh44b312d_0.tar.bz2#1d4c3605d85a3655b1595e0694138eb6
-https://conda.anaconda.org/conda-forge/linux-64/librsvg-2.50.3-hfa39831_1.tar.bz2#7578526979e852a1f8650080214c6cd6
-https://conda.anaconda.org/conda-forge/linux-64/matplotlib-base-3.4.1-py38hcc49a3a_0.tar.bz2#a39ef001290edc846f61d184ea734767
+https://conda.anaconda.org/conda-forge/linux-64/librsvg-2.50.5-hc3c00ef_0.tar.bz2#1362366116e80bcfbe9c7cd99766ea40
+https://conda.anaconda.org/conda-forge/linux-64/matplotlib-base-3.4.2-py38hcc49a3a_0.tar.bz2#4bfb6818a1fce6d4129fdf121f788505
 https://conda.anaconda.org/conda-forge/linux-64/netcdf4-1.5.6-nompi_py38h5e9db54_103.tar.bz2#72a5656daeee23c80e22b936bef0ceb3
 https://conda.anaconda.org/conda-forge/noarch/nodeenv-1.6.0-pyhd8ed1ab_0.tar.bz2#0941325bf48969e2b3b19d0951740950
-https://conda.anaconda.org/conda-forge/noarch/pip-21.1.1-pyhd8ed1ab_0.tar.bz2#e0bad1330c3575222d221e7679a36a0a
+https://conda.anaconda.org/conda-forge/noarch/pip-21.1.2-pyhd8ed1ab_0.tar.bz2#dbd830edaffe5fc9ae6c1d425db2b5f2
 https://conda.anaconda.org/conda-forge/noarch/pygments-2.9.0-pyhd8ed1ab_0.tar.bz2#a2d9bba43c9b80a42b0ccb9afd7223c2
 https://conda.anaconda.org/conda-forge/noarch/pyopenssl-20.0.1-pyhd8ed1ab_0.tar.bz2#92371c25994d0f5d28a01c1fb75ebf86
 https://conda.anaconda.org/conda-forge/linux-64/pyqt-impl-5.12.3-py38h7400c14_7.tar.bz2#8fe28c949b01e3d69c2b357b5abf3916
-https://conda.anaconda.org/conda-forge/linux-64/bokeh-2.1.1-py38h32f6830_0.tar.bz2#896f192315a5a04c878febacd67e64cd
 https://conda.anaconda.org/conda-forge/linux-64/cartopy-0.19.0.post1-py38hc9c980b_0.tar.bz2#65e97172e139d3465895eb07a1fd52f2
+https://conda.anaconda.org/conda-forge/noarch/dask-2021.5.1-pyhd8ed1ab_0.tar.bz2#6d88d5c849ba285e856125d6e4b79b6d
 https://conda.anaconda.org/conda-forge/linux-64/esmpy-8.1.1-mpi_mpich_py38h7f78e9f_100.tar.bz2#ce0ac0d6f5e6c5e7e0c613b08b3a0960
-https://conda.anaconda.org/conda-forge/linux-64/graphviz-2.47.1-hebd9034_0.tar.bz2#9840ac6c4756d7f4b6035a62aae4d6fb
+https://conda.anaconda.org/conda-forge/linux-64/graphviz-2.47.2-h85b4f2f_0.tar.bz2#d68568216287315890c4623397cf8633
 https://conda.anaconda.org/conda-forge/noarch/nc-time-axis-1.2.0-py_1.tar.bz2#f3158a5d335f0f44f09cf05d3fb4107e
-https://conda.anaconda.org/conda-forge/linux-64/pre-commit-2.12.1-py38h578d9bd_0.tar.bz2#c26dbf85b3b8699f6a551e1f63bf9580
+https://conda.anaconda.org/conda-forge/linux-64/pre-commit-2.13.0-py38h578d9bd_0.tar.bz2#1013dff06f574377c64f11efa7e2c016
 https://conda.anaconda.org/conda-forge/linux-64/pyqtchart-5.12-py38h7400c14_7.tar.bz2#3003444b4f41742a33b7afdeb3260cbc
 https://conda.anaconda.org/conda-forge/linux-64/pyqtwebengine-5.12.1-py38h7400c14_7.tar.bz2#1c17944e118b314ff4d0bfc05f03a5e1
 https://conda.anaconda.org/conda-forge/noarch/pyugrid-0.3.1-py_2.tar.bz2#7d7361886fbcf2be663fd185bf6d244d
-https://conda.anaconda.org/conda-forge/noarch/urllib3-1.26.4-pyhd8ed1ab_0.tar.bz2#d7b20b328e23d993994ea02077c009c0
-https://conda.anaconda.org/conda-forge/noarch/dask-2021.4.1-pyhd8ed1ab_0.tar.bz2#d954ba6326e7f5279444ea0f1c3dfd46
+https://conda.anaconda.org/conda-forge/noarch/urllib3-1.26.5-pyhd8ed1ab_0.tar.bz2#36f0ca66d6dd09423e5c2551148d45cd
 https://conda.anaconda.org/conda-forge/linux-64/pyqt-5.12.3-py38h578d9bd_7.tar.bz2#7166890c160d0441f59973a40b74f6e5
 https://conda.anaconda.org/conda-forge/noarch/requests-2.25.1-pyhd3deb0d_0.tar.bz2#ae687aba31a1c400192a86a2e993ffdc
-https://conda.anaconda.org/conda-forge/linux-64/matplotlib-3.4.1-py38h578d9bd_0.tar.bz2#850026fe180249b53fd3df025ea434f6
+https://conda.anaconda.org/conda-forge/linux-64/matplotlib-3.4.2-py38h578d9bd_0.tar.bz2#82aa0479b2189ab97f9e70b90d7ec866
 https://conda.anaconda.org/conda-forge/noarch/sphinx-3.5.4-pyh44b312d_0.tar.bz2#0ebc444f001f73c4f6de01057b0be392
 https://conda.anaconda.org/conda-forge/noarch/sphinx-copybutton-0.3.1-pyhd8ed1ab_0.tar.bz2#decad13214a2a545944560eccf4a9815
 https://conda.anaconda.org/conda-forge/noarch/sphinx-gallery-0.9.0-pyhd8ed1ab_0.tar.bz2#5ef222a3e1b5904742e376e05046692b

From 7628709a8a285d8025c82fe19107dc1f5d96e79a Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Thu, 3 Jun 2021 15:11:27 +0100
Subject: [PATCH 11/12] update docs pypi release (#4173)

---
 docs/src/developers_guide/release.rst | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/docs/src/developers_guide/release.rst b/docs/src/developers_guide/release.rst
index 9e7c74a6ae..b7e35fe072 100644
--- a/docs/src/developers_guide/release.rst
+++ b/docs/src/developers_guide/release.rst
@@ -107,10 +107,11 @@ source distribution (``sdist``) and pure Python wheel (``bdist_wheel``)::
     > conda create -n iris-pypi -c conda-forge --yes pip pyke python setuptools twine wheel
     > . activate iris-pypi
 
-Checkout the lastest Iris ``<release>`` tag::
+Checkout the appropriate Iris ``<release>`` tag from the appropriate ``<repo>``.
+For example, to checkout tag ``v1.0`` from ``upstream``::
 
-    > git fetch --tags
-    > git checkout <release>
+    > git fetch upstream --tags
+    > git checkout v1.0 
 
 Build the source distribution and wheel from the Iris root directory::
 
@@ -131,7 +132,7 @@ To list and check the contents of the binary wheel::
 If all seems well, sufficient maintainer privileges will be required to
 upload these artifacts to `scitools-iris`_ on PyPI::
 
-    > python -m twine upload --repository-url https://upload.pypi.org/legecy/ dist/*
+    > python -m twine upload --repository-url https://upload.pypi.org/legacy/ dist/*
 
 Ensure that the artifacts are successfully uploaded and available on
 `scitools-iris`_ before creating a conda test environment to install Iris

From d0eab4f0c2e212ccee8b42f830dd6991629dbae2 Mon Sep 17 00:00:00 2001
From: Bill Little <bill.james.little@gmail.com>
Date: Fri, 4 Jun 2021 11:30:07 +0100
Subject: [PATCH 12/12] refactor setup.py to setup.cfg (#4168)

* refactor setup.py to setup.cfg

* add keywords

* added a whatsnew entry

* review actions

* review actions

* rebase with review actions

* review actions
---
 MANIFEST.in                  |  11 ++--
 docs/src/whatsnew/latest.rst |   2 +
 requirements/all.txt         |   7 ---
 requirements/core.txt        |  11 ----
 requirements/docs.txt        |   8 ---
 requirements/setup.txt       |   4 --
 requirements/test.txt        |  10 ----
 setup.cfg                    |  95 +++++++++++++++++++++++++++++++
 setup.py                     | 106 -----------------------------------
 9 files changed, 104 insertions(+), 150 deletions(-)
 delete mode 100644 requirements/all.txt
 delete mode 100644 requirements/core.txt
 delete mode 100644 requirements/docs.txt
 delete mode 100644 requirements/setup.txt
 delete mode 100644 requirements/test.txt
 create mode 100644 setup.cfg

diff --git a/MANIFEST.in b/MANIFEST.in
index 99b801e827..1902f6a74f 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -3,15 +3,17 @@ include CHANGES COPYING COPYING.LESSER
 
 # Files from setup.py package_data that are not automatically added to source distributions
 recursive-include lib/iris/tests/results *.cml *.cdl *.txt *.xml *.json
+recursive-exclude lib/iris/fileformats/_pyke_rules/compiled_krb *
 recursive-include lib/iris/etc *
-include lib/iris/fileformats/_pyke_rules/*.k?b
-include lib/iris/tests/stock*.npz
+include lib/iris/fileformats/_pyke_rules/*.krb
 
-include requirements/*.txt
+recursive-include requirements *
 
 # File required to build docs
 recursive-include docs Makefile *.js *.png *.py *.rst
-prune docs/build
+prune docs/src/_build
+prune docs/src/generated
+prune docs/gallery_tests
 
 # Files required to build std_names module
 include tools/generate_std_names.py
@@ -19,3 +21,4 @@ include etc/cf-standard-name-table.xml
 
 global-exclude *.pyc
 global-exclude __pycache__
+global-exclude iris_image_test_output
diff --git a/docs/src/whatsnew/latest.rst b/docs/src/whatsnew/latest.rst
index 7633bff9c2..1018e5b19a 100644
--- a/docs/src/whatsnew/latest.rst
+++ b/docs/src/whatsnew/latest.rst
@@ -173,6 +173,8 @@ This document explains the changes made to Iris for this release
    supported Python versions tested by `cirrus-ci`_ for documentation.
    (:pull:`4163`)
 
+#. `@bjlittle`_ refactored ``setup.py`` into ``setup.cfg``. (:pull:`4168`)
+
 .. comment
     Whatsnew author names (@github name) in alphabetical order. Note that,
     core dev names are automatically included by the common_links.inc:
diff --git a/requirements/all.txt b/requirements/all.txt
deleted file mode 100644
index 6d7bb942cf..0000000000
--- a/requirements/all.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-# Optional dependencies.
-
-mo_pack
-nc-time-axis
-pandas
-pyugrid
-stratify
diff --git a/requirements/core.txt b/requirements/core.txt
deleted file mode 100644
index 9e0c4fb1bb..0000000000
--- a/requirements/core.txt
+++ /dev/null
@@ -1,11 +0,0 @@
-# Core dependencies.
-
-cartopy>=0.18
-cf-units>=2
-cftime<1.3.0
-dask[array]>=2
-matplotlib
-netcdf4
-numpy>=1.14
-scipy
-xxhash
diff --git a/requirements/docs.txt b/requirements/docs.txt
deleted file mode 100644
index f9de791213..0000000000
--- a/requirements/docs.txt
+++ /dev/null
@@ -1,8 +0,0 @@
-# Documentation dependencies.
-
-sphinx
-sphinx-copybutton
-sphinx-gallery
-sphinx_rtd_theme
-sphinxcontrib-napoleon
-sphinx-panels
diff --git a/requirements/setup.txt b/requirements/setup.txt
deleted file mode 100644
index 9232946a6a..0000000000
--- a/requirements/setup.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-# Dependencies necessary to run setup.py of iris
-# ----------------------------------------------
-
-setuptools>=40.8.0
diff --git a/requirements/test.txt b/requirements/test.txt
deleted file mode 100644
index 8a720c3e78..0000000000
--- a/requirements/test.txt
+++ /dev/null
@@ -1,10 +0,0 @@
-# Test dependencies.
-
-asv
-black==21.5b2
-filelock
-imagehash>=4.0
-nose
-pillow<7
-pre-commit
-requests
diff --git a/setup.cfg b/setup.cfg
new file mode 100644
index 0000000000..b27e0c53d8
--- /dev/null
+++ b/setup.cfg
@@ -0,0 +1,95 @@
+[metadata]
+author = SciTools Developers
+author_email = scitools-iris-dev@googlegroups.com
+classifiers =
+    Development Status :: 5 Production/Stable
+    Intended Audience :: Science/Research
+    License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)
+    Operating System :: MacOS
+    Operating System :: POSIX
+    Operating System :: POSIX :: Linux
+    Operating System :: Unix
+    Programming Language :: Python
+    Programming Language :: Python :: 3 :: Only
+    Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
+    Programming Language :: Python :: Implementation :: CPython
+    Topic :: Scientific/Engineering
+    Topic :: Scientific/Engineering :: Atmospheric Science
+    Topic :: Scientific/Engineering :: Visualization
+description =
+    A powerful, format-agnostic, community-driven Python package for analysing and visualising Earth science data
+download_url = https://github.com/SciTools/iris
+keywords =
+    cf-metadata
+    data-analysis
+    earth-science
+    grib
+    netcdf
+    meteorology
+    oceanography
+    space-weather
+    ugrid
+    visualisation
+license = LGPL-3.0-or-later
+license_file = COPYING.LESSER
+long_description = file: README.md
+long_description_content_type = text/markdown
+name = scitools-iris
+project_urls =
+    Code = https://github.com/SciTools/iris
+    Discussions = https://github.com/SciTools/iris/discussions
+    Documentation = https://scitools-iris.readthedocs.io/en/stable/
+    Issues = https://github.com/SciTools/iris/issues
+url = https://github.com/SciTools/iris
+version = attr: iris.__version__
+
+[options]
+include_package_data = True
+install_requires =
+    cartopy>=0.18
+    cf-units>=2
+    cftime<1.3.0
+    dask[array]>=2
+    matplotlib
+    netcdf4
+    numpy>=1.14
+    scipy
+    scitools-pyke
+    xxhash
+packages = find:
+package_dir =
+    =lib
+python_requires =
+    >=3.7
+zip_safe = False
+
+[options.packages.find]
+where = lib
+
+[options.extras_require]
+docs =
+    sphinx
+    sphinx-copybutton
+    sphinx-gallery
+    sphinx_rtd_theme
+    sphinxcontrib-napoleon
+    sphinx-panels
+test =
+    asv
+    black==21.5b2
+    filelock
+    flake8
+    imagehash>=4.0
+    nose
+    pillow<7
+    pre-commit
+    requests
+all =
+    mo_pack
+    nc-time-axis
+    pandas
+    pyugrid
+    stratify
+    %(docs)s
+    %(test)s
\ No newline at end of file
diff --git a/setup.py b/setup.py
index d6391e07a6..a767243df9 100644
--- a/setup.py
+++ b/setup.py
@@ -1,5 +1,4 @@
 from contextlib import contextmanager
-from distutils.util import convert_path
 import os
 from shutil import copyfile
 import sys
@@ -10,50 +9,6 @@
 from setuptools.command.build_py import build_py
 
 
-PACKAGE_DIR = os.path.abspath(os.path.dirname(__file__))
-PYPI_NAME = "scitools-iris"
-
-
-# Returns the package and all its sub-packages
-def find_package_tree(root_path, root_package):
-    root_path = root_path.replace("/", os.path.sep)
-    packages = [root_package]
-    root_count = len(root_path.split(os.path.sep))
-    for (dir_path, dir_names, file_names) in os.walk(convert_path(root_path)):
-        # Prune dir_names *in-place* to prevent unwanted directory recursion
-        for dir_name in list(dir_names):
-            contains_init_file = os.path.isfile(
-                os.path.join(dir_path, dir_name, "__init__.py")
-            )
-            if not contains_init_file:
-                dir_names.remove(dir_name)
-            # Exclude compiled PyKE rules, but keep associated unit tests.
-            if dir_name == "compiled_krb" and "tests" not in dir_path:
-                dir_names.remove(dir_name)
-        if dir_names:
-            prefix = dir_path.split(os.path.sep)[root_count:]
-            packages.extend(
-                [
-                    ".".join([root_package] + prefix + [dir_name])
-                    for dir_name in dir_names
-                ]
-            )
-    return packages
-
-
-def file_walk_relative(top, remove=""):
-    """
-    Returns a generator of files from the top of the tree, removing
-    the given prefix from the root/file result.
-
-    """
-    top = top.replace("/", os.path.sep)
-    remove = remove.replace("/", os.path.sep)
-    for root, dirs, files in os.walk(top):
-        for file in files:
-            yield os.path.join(root, file).replace(remove, "")
-
-
 @contextmanager
 def temporary_path(directory):
     """
@@ -74,26 +29,6 @@ def temporary_path(directory):
     from _runner import TestRunner  # noqa:
 
 
-def pip_requirements(*args):
-    requirements = []
-    for name in args:
-        fname = os.path.join(
-            PACKAGE_DIR, "requirements", "{}.txt".format(name)
-        )
-        if not os.path.exists(fname):
-            emsg = (
-                f"Unable to find the {name!r} requirements file at {fname!r}."
-            )
-            raise RuntimeError(emsg)
-        with open(fname, "r") as fh:
-            for line in fh:
-                line = line.strip()
-                if not line or line.startswith("#"):
-                    continue
-                requirements.append(line)
-    return requirements
-
-
 class SetupTestRunner(TestRunner, Command):
     pass
 
@@ -217,25 +152,6 @@ def run(self):
     return ExtendedCommand
 
 
-def extract_version():
-    version = None
-    fname = os.path.join(PACKAGE_DIR, "lib", "iris", "__init__.py")
-    with open(fname) as fi:
-        for line in fi:
-            if line.startswith("__version__"):
-                _, version = line.split("=")
-                version = version.strip()[1:-1]  # Remove quotations
-                break
-    return version
-
-
-def long_description():
-    fname = os.path.join(PACKAGE_DIR, "README.md")
-    with open(fname, "rb") as fi:
-        result = fi.read().decode("utf-8")
-    return result
-
-
 custom_commands = {
     "test": SetupTestRunner,
     "develop": custom_cmd(develop_cmd, [build_std_names, compile_pyke_rules]),
@@ -257,27 +173,5 @@ def long_description():
 
 
 setup(
-    name=PYPI_NAME,
-    version=extract_version(),
-    url="http://scitools.org.uk/iris/",
-    author="UK Met Office",
-    author_email="scitools-iris-dev@googlegroups.com",
-    description="A powerful, format-agnostic, community-driven Python "
-    "package for analysing and visualising Earth science data",
-    long_description=long_description(),
-    long_description_content_type="text/markdown",
-    packages=find_package_tree("lib/iris", "iris"),
-    package_dir={"": "lib"},
-    include_package_data=True,
     cmdclass=custom_commands,
-    zip_safe=False,
-    setup_requires=pip_requirements("setup"),
-    install_requires=pip_requirements("setup", "core"),
-    tests_require=[f"{PYPI_NAME}[test]"],
-    extras_require={
-        "all": pip_requirements("all"),
-        "docs": pip_requirements("docs"),
-        "test": pip_requirements("test"),
-    },
-    python_requires=">=3.7",
 )