Refs #23919 -- Removed misc references to Python 2.

django/db/backends/mysql/base.py

@@ -2,7 +2,6 @@
 MySQL database backend for Django.
 
 Requires mysqlclient: https://pypi.python.org/pypi/mysqlclient/
-MySQLdb is supported for Python 2 only: http://sourceforge.net/projects/mysql-python
 """
 import re
 import sys

django/db/backends/oracle/introspection.py

@@ -81,7 +81,7 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
             self.cache_bust_counter))
         description = []
         for desc in cursor.description:
-            name = force_text(desc[0])  # cx_Oracle always returns a 'str' on both Python 2 and 3
+            name = force_text(desc[0])  # cx_Oracle always returns a 'str'
             internal_size, default = field_map[name]
             name = name % {}  # cx_Oracle, for some reason, doubles percent signs.
             description.append(FieldInfo(*(name.lower(),) + desc[1:3] + (internal_size,) + desc[4:] + (default,)))

django/db/migrations/serializer.py

@@ -160,24 +160,14 @@ class FunctionTypeSerializer(BaseSerializer):
             if "<" not in self.value.__qualname__:  # Qualname can include <locals>
                 return "%s.%s" % \
                     (self.value.__module__, self.value.__qualname__), {"import %s" % self.value.__module__}
-        # Python 2/fallback version
+        # Fallback version
         module_name = self.value.__module__
-        # Make sure it's actually there and not an unbound method
+        # Make sure it's actually there
         module = import_module(module_name)
         if not hasattr(module, self.value.__name__):
             raise ValueError(
-                "Could not find function %s in %s.\n"
-                "Please note that due to Python 2 limitations, you cannot "
-                "serialize unbound method functions (e.g. a method "
-                "declared and used in the same class body). Please move "
-                "the function into the main module body to use migrations.\n"
-                "For more information, see "
-                "https://docs.djangoproject.com/en/%s/topics/migrations/#serializing-values"
-                % (self.value.__name__, module_name, get_docs_version())
+                "Could not find function %s in %s.\n" % (self.value.__name__, module_name)
             )
-        # Needed on Python 2 only
-        if module_name == '__builtin__':
-            return self.value.__name__, set()
         return "%s.%s" % (module_name, self.value.__name__), {"import %s" % module_name}
 
 

django/db/models/expressions.py

@@ -60,9 +60,6 @@ class Combinable:
     def __truediv__(self, other):
         return self._combine(other, self.DIV, False)
 
-    def __div__(self, other):  # Python 2 compatibility
-        return type(self).__truediv__(self, other)
-
     def __mod__(self, other):
         return self._combine(other, self.MOD, False)
 
@@ -103,9 +100,6 @@ class Combinable:
     def __rtruediv__(self, other):
         return self._combine(other, self.DIV, True)
 
-    def __rdiv__(self, other):  # Python 2 compatibility
-        return type(self).__rtruediv__(self, other)
-
     def __rmod__(self, other):
         return self._combine(other, self.MOD, True)
 

django/db/models/query_utils.py

@@ -27,11 +27,8 @@ class InvalidQuery(Exception):
 
 def subclasses(cls):
     yield cls
-    # Python 2 lacks 'yield from', which could replace the inner loop
     for subclass in cls.__subclasses__():
-        # yield from subclasses(subclass)
-        for item in subclasses(subclass):
-            yield item
+        yield from subclasses(subclass)
 
 
 class QueryWrapper:

django/db/models/sql/compiler.py

@@ -875,14 +875,8 @@ class SQLCompiler:
         try:
             cursor.execute(sql, params)
         except Exception:
-            try:
-                # Might fail for server-side cursors (e.g. connection closed)
-                cursor.close()
-            except Exception:
-                # Ignore clean up errors and raise the original error instead.
-                # Python 2 doesn't chain exceptions. Remove this error
-                # silencing when dropping Python 2 compatibility.
-                pass
+            # Might fail for server-side cursors (e.g. connection closed)
+            cursor.close()
             raise
 
         if result_type == CURSOR: