Fixed #30116 -- Dropped support for Python 3.5.

django/utils/functional.py

@@ -3,8 +3,6 @@ import itertools
 import operator
 from functools import total_ordering, wraps
 
-from django.utils.version import PY36, get_docs_version
-
 
 # You can't trivially replace this with `functools.partial` because this binds
 # to classes and returns bound instances, whereas functools.partial (on
@@ -22,8 +20,8 @@ class cached_property:
 
     A cached property can be made out of an existing method:
     (e.g. ``url = cached_property(get_absolute_url)``).
-    On Python < 3.6, the optional ``name`` argument must be provided, e.g.
-    ``url = cached_property(get_absolute_url, name='url')``.
+    The optional ``name`` argument is obsolete as of Python 3.6 and will be
+    deprecated in Django 4.0 (#30127).
     """
     name = None
 
@@ -34,29 +32,8 @@ class cached_property:
             '__set_name__() on it.'
         )
 
-    @staticmethod
-    def _is_mangled(name):
-        return name.startswith('__') and not name.endswith('__')
-
     def __init__(self, func, name=None):
-        if PY36:
-            self.real_func = func
-        else:
-            func_name = func.__name__
-            name = name or func_name
-            if not (isinstance(name, str) and name.isidentifier()):
-                raise ValueError(
-                    "%r can't be used as the name of a cached_property." % name,
-                )
-            if self._is_mangled(name):
-                raise ValueError(
-                    'cached_property does not work with mangled methods on '
-                    'Python < 3.6 without the appropriate `name` argument. See '
-                    'https://docs.djangoproject.com/en/%s/ref/utils/'
-                    '#cached-property-mangled-name' % get_docs_version(),
-                )
-            self.name = name
-            self.func = func
+        self.real_func = func
         self.__doc__ = getattr(func, '__doc__')
 
     def __set_name__(self, owner, name):