Fixed #24979 -- Removed usage of inspect.getargspec().

django/dispatch/dispatcher.py

@@ -4,6 +4,7 @@ import warnings
 import weakref
 
 from django.utils.deprecation import RemovedInDjango21Warning
+from django.utils.inspect import func_accepts_kwargs
 from django.utils.six.moves import range
 
 if sys.version_info < (3, 4):
@@ -89,24 +90,11 @@ class Signal(object):
 
         # If DEBUG is on, check that we got a good receiver
         if settings.configured and settings.DEBUG:
-            import inspect
             assert callable(receiver), "Signal receivers must be callable."
 
             # Check for **kwargs
-            # Not all callables are inspectable with getargspec, so we'll
-            # try a couple different ways but in the end fall back on assuming
-            # it is -- we don't want to prevent registration of valid but weird
-            # callables.
-            try:
-                argspec = inspect.getargspec(receiver)
-            except TypeError:
-                try:
-                    argspec = inspect.getargspec(receiver.__call__)
-                except (TypeError, AttributeError):
-                    argspec = None
-            if argspec:
-                assert argspec[2] is not None, \
-                    "Signal receivers must accept keyword arguments (**kwargs)."
+            if not func_accepts_kwargs(receiver):
+                raise ValueError("Signal receivers must accept keyword arguments (**kwargs).")
 
         if dispatch_uid:
             lookup_key = (dispatch_uid, _make_id(sender))