commit 42407abe2450819b74b9ccb1fbe99edc78bbbb41
author Yury Selivanov <yselivanov@sprymix.com> Mon Jun 23 10:23:50 2014 -0700
committer Yury Selivanov <yselivanov@sprymix.com> Mon Jun 23 10:23:50 2014 -0700
tree 4ebda4c6d2a697ab25969063485329f50cc60b3a
parent 289cae4f929997bcfe9689c3e9dd7a3be5e5919f

inspect: Validate that __signature__ is None or an instance of Signature.

Closes #21801.

Lib/inspect.py

diff --git a/Lib/inspect.py b/Lib/inspect.py
index 4ac76b1..b9cdcc2 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -1939,6 +1939,10 @@
         pass
     else:
         if sig is not None:
+            if not isinstance(sig, Signature):
+                raise TypeError(
+                    'unexpected object {!r} in __signature__ '
+                    'attribute'.format(sig))
             return sig
 
     try: