Removed unneeded parentheses in class definitions

django/core/mail/message.py

@@ -123,7 +123,7 @@ def sanitize_address(addr, encoding):
     return str(address)
 
 
-class MIMEMixin():
+class MIMEMixin:
     def as_string(self, unixfrom=False, linesep='\n'):
         """Return the entire formatted message as a string.
         Optional `unixfrom' when True, means include the Unix From_ envelope

tests/model_fields/test_imagefield.py

@@ -21,7 +21,7 @@ if Image:
     from .models import temp_storage_dir
 else:
     # Pillow not available, create dummy classes (tests will be skipped anyway)
-    class Person():
+    class Person:
         pass
     PersonWithHeight = PersonWithHeightAndWidth = PersonDimensionsFirst = Person
     PersonTwoImages = Person