Drop python 3.7 (#359)

* Drop python 3.7

Its no longer supported and breaking the build

* Run pyupgrade over the code

* Isort

.github/workflows/verify.yaml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ "3.7", "3.8", "3.9", "3.10", "3.11" ]
+        python-version: [ "3.8", "3.9", "3.10", "3.11" ]
     steps:
       - run: echo "🎉 The job was automatically triggered by a ${{ github.event_name }} event."
       - run: echo "🔎 The name of your branch is ${{ github.ref }} and your repository is ${{ github.repository }}."

diff_cover/diff_reporter.py

@@ -455,7 +455,7 @@ def _parse_hunk_line(self, line):
                     return int(groups[0])
 
                 except ValueError:
-                    msg = "Could not parse '{}' as a line number".format(groups[0])
+                    msg = f"Could not parse '{groups[0]}' as a line number"
                     raise GitDiffError(msg)
 
             else:

diff_cover/violationsreporters/java_violations_reporter.py

@@ -7,7 +7,7 @@
 
 try:
     # Needed for Python < 3.3, works up to 3.8
-    import xml.etree.cElementTree as etree
+    import xml.etree.ElementTree as etree
 except ImportError:
     # Python 3.9 onwards
     import xml.etree.ElementTree as etree

diff_cover/violationsreporters/violations_reporter.py

@@ -288,7 +288,7 @@ def parse(lcov_file):
         File format: https://ltp.sourceforge.net/coverage/lcov/geninfo.1.php
         """
         lcov_report = defaultdict(dict)
-        lcov = open(lcov_file, "r")
+        lcov = open(lcov_file)
         while True:
             line = lcov.readline()
             if not line:

pyproject.toml

@@ -15,7 +15,6 @@ classifiers=[
         "Operating System :: OS Independent",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
@@ -40,7 +39,7 @@ diff-cover = 'diff_cover.diff_cover_tool:main'
 diff-quality = 'diff_cover.diff_quality_tool:main'
 
 [tool.poetry.dependencies]
-python = "^3.7.2"
+python = "^3.8.10"
 Pygments = "^2.9.0"
 Jinja2 = ">=2.7.1"
 pluggy = ">=0.13.1,<2"

tests/test_violations_reporter.py

@@ -5,15 +5,8 @@
 
 import os
 import subprocess
+import xml.etree.ElementTree as etree
 from io import BytesIO, StringIO
-
-try:
-    # Needed for Python < 3.3, works up to 3.8
-    import xml.etree.cElementTree as etree
-except ImportError:
-    # Python 3.9 onwards
-    import xml.etree.ElementTree as etree
-
 from subprocess import Popen
 from textwrap import dedent
 
@@ -128,12 +121,8 @@ def test_non_python_violations(self):
         )
         coverage = XmlCoverageReporter([xml])
 
-        assert violations == coverage.violations(
-            "{}/{}".format(fancy_path, file_paths[0])
-        )
-        assert measured == coverage.measured_lines(
-            "{}/{}".format(fancy_path, file_paths[0])
-        )
+        assert violations == coverage.violations(f"{fancy_path}/{file_paths[0]}")
+        assert measured == coverage.measured_lines(f"{fancy_path}/{file_paths[0]}")
 
     def test_non_python_violations_empty_path(self):
         """
@@ -1699,9 +1688,7 @@ def _get_out(self):
 
     def test_report_root_path(self):
         reports = [
-            BytesIO(
-                "foo/bar/path/to/file.js: line 3, col 9, Found issue".encode("utf-8")
-            ),
+            BytesIO(b"foo/bar/path/to/file.js: line 3, col 9, Found issue"),
         ]
 
         driver = self._get_out()