Add pyupgrade to pre-commit hooks (#9682)

Author: ulgens

.pre-commit-config.yaml

@@ -31,3 +31,9 @@ repos:
   hooks:
   - id: codespell
     exclude: locale|kickstarter-announcement.md|coreapi-0.1.1.js
+
+- repo: https://github.com/asottile/pyupgrade
+  rev: v3.19.1
+  hooks:
+  - id: pyupgrade
+    args: ["--py39-plus", "--keep-percent-format"]

rest_framework/authtoken/management/commands/drf_create_token.py

@@ -42,4 +42,4 @@ def handle(self, *args, **options):
                     username)
             )
         self.stdout.write(
-            'Generated token {} for user {}'.format(token.key, username))
+            f'Generated token {token.key} for user {username}')

rest_framework/fields.py

@@ -111,7 +111,7 @@ def get_attribute(instance, attrs):
                 # If we raised an Attribute or KeyError here it'd get treated
                 # as an omitted field in `Field.get_attribute()`. Instead we
                 # raise a ValueError to ensure the exception is not masked.
-                raise ValueError('Exception raised in callable attribute "{}"; original exception was: {}'.format(attr, exc))
+                raise ValueError(f'Exception raised in callable attribute "{attr}"; original exception was: {exc}')
 
     return instance
 
@@ -1103,7 +1103,7 @@ def to_representation(self, value):
         if self.localize:
             return localize_input(quantized)
 
-        return '{:f}'.format(quantized)
+        return f'{quantized:f}'
 
     def quantize(self, value):
         """
@@ -1861,7 +1861,7 @@ def __init__(self, method_name=None, **kwargs):
     def bind(self, field_name, parent):
         # The method name defaults to `get_{field_name}`.
         if self.method_name is None:
-            self.method_name = 'get_{field_name}'.format(field_name=field_name)
+            self.method_name = f'get_{field_name}'
 
         super().bind(field_name, parent)
 

rest_framework/negotiation.py

@@ -65,7 +65,7 @@ def select_renderer(self, request, renderers, format_suffix=None):
                             full_media_type = ';'.join(
                                 (renderer.media_type,) +
                                 tuple(
-                                    '{}={}'.format(key, value)
+                                    f'{key}={value}'
                                     for key, value in media_type_wrapper.params.items()
                                 )
                             )

rest_framework/permissions.py

@@ -225,7 +225,7 @@ def _queryset(self, view):
         if hasattr(view, 'get_queryset'):
             queryset = view.get_queryset()
             assert queryset is not None, (
-                '{}.get_queryset() returned None'.format(view.__class__.__name__)
+                f'{view.__class__.__name__}.get_queryset() returned None'
             )
             return queryset
         return view.queryset

rest_framework/response.py

@@ -66,7 +66,7 @@ def rendered_content(self):
         content_type = self.content_type
 
         if content_type is None and charset is not None:
-            content_type = "{}; charset={}".format(media_type, charset)
+            content_type = f"{media_type}; charset={charset}"
         elif content_type is None:
             content_type = media_type
         self['Content-Type'] = content_type

rest_framework/schemas/coreapi.py

@@ -68,7 +68,7 @@ def get_available_key(self, preferred_key):
             current_val = self.methods_counter[preferred_key]
             self.methods_counter[preferred_key] += 1
 
-            key = '{}_{}'.format(preferred_key, current_val)
+            key = f'{preferred_key}_{current_val}'
             if key not in self:
                 return key
 

rest_framework/schemas/openapi.py

@@ -82,7 +82,7 @@ def get_schema(self, request=None, public=False):
                     continue
                 if components_schemas[k] == components[k]:
                     continue
-                warnings.warn('Schema component "{}" has been overridden with a different value.'.format(k))
+                warnings.warn(f'Schema component "{k}" has been overridden with a different value.')
 
             components_schemas.update(components)
 
@@ -644,7 +644,7 @@ def get_response_serializer(self, path, method):
         return self.get_serializer(path, method)
 
     def get_reference(self, serializer):
-        return {'$ref': '#/components/schemas/{}'.format(self.get_component_name(serializer))}
+        return {'$ref': f'#/components/schemas/{self.get_component_name(serializer)}'}
 
     def get_request_body(self, path, method):
         if method not in ('PUT', 'PATCH', 'POST'):

rest_framework/utils/field_mapping.py

@@ -66,7 +66,7 @@ def get_unique_validators(field_name, model_field):
     """
     Returns a list of UniqueValidators that should be applied to the field.
     """
-    field_set = set([field_name])
+    field_set = {field_name}
     conditions = {
         c.condition
         for c in model_field.model._meta.constraints

tests/schemas/test_coreapi.py

@@ -1234,7 +1234,7 @@ def _verify_cbv_links(self, loc, url, methods=None, suffixes=None):
 
         for method, suffix in zip(methods, suffixes):
             if suffix is not None:
-                key = '{}_{}'.format(method, suffix)
+                key = f'{method}_{suffix}'
             else:
                 key = method
             assert loc[key].url == url