[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

nbformat/json_compat.py

@@ -90,9 +90,7 @@ def _validator_for_name(validator_name):
             return validator_cls
     # we always return something.
     raise ValueError(
-        "Missing validator for {validator_name}".format(
-            validator_name=repr(validator_name)
-        )
+        f"Missing validator for {repr(validator_name)}"
     )
 
 

nbformat/validator.py

@@ -2,7 +2,6 @@
 # Distributed under the terms of the Modified BSD License.
 
 
-
 import json
 import os
 import pprint
@@ -16,8 +15,7 @@
 from .corpus.words import generate_corpus_id
 from .json_compat import ValidationError, _validator_for_name, get_current_validator
 from .reader import get_version
-from .warnings import MissingIDFieldWarning, DuplicateCellId
-
+from .warnings import DuplicateCellId, MissingIDFieldWarning
 
 validators = {}
 
@@ -282,6 +280,7 @@ def normalize(nbdict, version, version_minor):
     nbdict = deepcopy(nbdict)
     return _normalize(nbdict)
 
+
 def _normalize(nbdict, version, version_minor, repair_duplicate_cell_ids):
     changes = 0
 
@@ -326,6 +325,7 @@ def _normalize(nbdict, version, version_minor, repair_duplicate_cell_ids):
             seen_ids.add(cell_id)
     return changes, nbdict
 
+
 def validate(
     nbdict=None,
     ref=None,
@@ -368,7 +368,6 @@ def validate(
         if version is None:
             version, version_minor = 1, 0
 
-
     if ref is None:
         _normalize(nbdict, version, version_minor, repair_duplicate_cell_ids)
 

tests/test_validator.py

@@ -6,6 +6,7 @@
 import json
 import os
 import re
+from copy import deepcopy
 
 import pytest
 from jsonschema import ValidationError
@@ -14,11 +15,10 @@
 from nbformat import read
 from nbformat.json_compat import VALIDATORS
 from nbformat.validator import isvalid, iter_validate, validate
-
+from nbformat.warnings import DuplicateCellId, MissingIDFieldWarning
 
 from .base import TestsBase
-from copy import deepcopy
-from nbformat.warnings import MissingIDFieldWarning, DuplicateCellId
+
 nb4 = ("test4.ipynb", "test4.5.ipynb")
 
 
@@ -40,7 +40,7 @@ def set_validator(validator_name):
 def test_should_warn(validator_name):
     """Test that a v4 notebook witout id emit a warning"""
     set_validator(validator_name)
-    with TestsBase.fopen(u"test4.5.ipynb", u"r") as f:
+    with TestsBase.fopen("test4.5.ipynb", "r") as f:
         nb = read(f, as_version=4)
 
     del nb.cells[3]["id"]
@@ -62,7 +62,7 @@ def test_should_not_mutate(validator_name):
     Probably should be 2 test. To enable in the future.
     """
     set_validator(validator_name)
-    with TestsBase.fopen(u"test4.5.ipynb", u"r") as f:
+    with TestsBase.fopen("test4.5.ipynb", "r") as f:
         nb = read(f, as_version=4)
 
     del nb.cells[3]["id"]