Fixed #31327 -- Deprecated providing_args argument for Signal.

django/dispatch/dispatcher.py

@@ -1,6 +1,8 @@
 import threading
+import warnings
 import weakref
 
+from django.utils.deprecation import RemovedInDjango40Warning
 from django.utils.inspect import func_accepts_kwargs
 
 
@@ -28,14 +30,16 @@ class Signal:
     def __init__(self, providing_args=None, use_caching=False):
         """
         Create a new signal.
-
-        providing_args
-            A list of the arguments this signal can pass along in a send() call.
         """
         self.receivers = []
-        if providing_args is None:
-            providing_args = []
-        self.providing_args = set(providing_args)
+        if providing_args is not None:
+            warnings.warn(
+                'The providing_args argument is deprecated. As it is purely '
+                'documentational, it has no replacement. If you rely on this '
+                'argument as documentation, you can move the text to a code '
+                'comment or docstring.',
+                RemovedInDjango40Warning, stacklevel=2,
+            )
         self.lock = threading.Lock()
         self.use_caching = use_caching
         # For convenience we create empty caches even if they are not used.
@@ -187,9 +191,7 @@ class Signal:
                 occur).
 
             named
-                Named arguments which will be passed to receivers. These
-                arguments must be a subset of the argument names defined in
-                providing_args.
+                Named arguments which will be passed to receivers.
 
         Return a list of tuple pairs [(receiver, response), ... ].