Refs #23919 -- Removed unneeded str() calls

django/db/backends/sqlite3/base.py

@@ -45,13 +45,13 @@ def decoder(conv_func):
     return lambda s: conv_func(s.decode('utf-8'))
 
 
-Database.register_converter(str("bool"), decoder(lambda s: s == '1'))
-Database.register_converter(str("time"), decoder(parse_time))
-Database.register_converter(str("date"), decoder(parse_date))
-Database.register_converter(str("datetime"), decoder(parse_datetime))
-Database.register_converter(str("timestamp"), decoder(parse_datetime))
-Database.register_converter(str("TIMESTAMP"), decoder(parse_datetime))
-Database.register_converter(str("decimal"), decoder(backend_utils.typecast_decimal))
+Database.register_converter("bool", decoder(lambda s: s == '1'))
+Database.register_converter("time", decoder(parse_time))
+Database.register_converter("date", decoder(parse_date))
+Database.register_converter("datetime", decoder(parse_datetime))
+Database.register_converter("timestamp", decoder(parse_datetime))
+Database.register_converter("TIMESTAMP", decoder(parse_datetime))
+Database.register_converter("decimal", decoder(backend_utils.typecast_decimal))
 
 Database.register_adapter(decimal.Decimal, backend_utils.rev_typecast_decimal)
 

django/db/models/base.py

@@ -35,10 +35,10 @@ from django.utils.version import get_version
 
 class Deferred:
     def __repr__(self):
-        return str('<Deferred field>')
+        return '<Deferred field>'
 
     def __str__(self):
-        return str('<Deferred field>')
+        return '<Deferred field>'
 
 
 DEFERRED = Deferred()
@@ -118,7 +118,7 @@ class ModelBase(type):
             new_class.add_to_class(
                 'DoesNotExist',
                 subclass_exception(
-                    str('DoesNotExist'),
+                    'DoesNotExist',
                     tuple(
                         x.DoesNotExist for x in parents if hasattr(x, '_meta') and not x._meta.abstract
                     ) or (ObjectDoesNotExist,),
@@ -127,7 +127,7 @@ class ModelBase(type):
             new_class.add_to_class(
                 'MultipleObjectsReturned',
                 subclass_exception(
-                    str('MultipleObjectsReturned'),
+                    'MultipleObjectsReturned',
                     tuple(
                         x.MultipleObjectsReturned for x in parents if hasattr(x, '_meta') and not x._meta.abstract
                     ) or (MultipleObjectsReturned,),

django/db/models/fields/__init__.py

@@ -32,9 +32,7 @@ from django.utils.itercompat import is_iterable
 from django.utils.text import capfirst
 from django.utils.translation import ugettext_lazy as _
 
-# Avoid "TypeError: Item in ``from list'' not a string" -- unicode_literals
-# makes these strings unicode
-__all__ = [str(x) for x in (
+__all__ = [
     'AutoField', 'BLANK_CHOICE_DASH', 'BigAutoField', 'BigIntegerField',
     'BinaryField', 'BooleanField', 'CharField', 'CommaSeparatedIntegerField',
     'DateField', 'DateTimeField', 'DecimalField', 'DurationField',
@@ -43,7 +41,7 @@ __all__ = [str(x) for x in (
     'NOT_PROVIDED', 'NullBooleanField', 'PositiveIntegerField',
     'PositiveSmallIntegerField', 'SlugField', 'SmallIntegerField', 'TextField',
     'TimeField', 'URLField', 'UUIDField',
-)]
+]
 
 
 class Empty:

django/db/models/fields/files.py

@@ -277,7 +277,7 @@ class FileField(Field):
     def get_prep_value(self, value):
         "Returns field's value prepared for saving into a database."
         value = super(FileField, self).get_prep_value(value)
-        # Need to convert File objects provided via a form to unicode for database insertion
+        # Need to convert File objects provided via a form to string for database insertion
         if value is None:
             return None
         return str(value)

django/db/models/indexes.py

@@ -2,7 +2,7 @@ import hashlib
 
 from django.utils.encoding import force_bytes
 
-__all__ = [str('Index')]
+__all__ = ['Index']
 
 # The max length of the names of the indexes (restricted to 30 due to Oracle)
 MAX_NAME_LENGTH = 30