commit 323c40d48c4c1661a18336af16c59bc279fda571
author Benjamin Peterson <benjamin@python.org> Tue May 06 22:31:52 2008 +0000
committer Benjamin Peterson <benjamin@python.org> Tue May 06 22:31:52 2008 +0000
tree a1938a5f6aa2440d9656fea2e5a9247015000ac9
parent d29503291013b7dfd70522e776b0c244aff0a264

Make the Python implementation of warnings compatible with the C implementation regarding non-callable showwarning

Lib/warnings.py

diff --git a/Lib/warnings.py b/Lib/warnings.py
index d9e6e44..132a34d 100644
--- a/Lib/warnings.py
+++ b/Lib/warnings.py
@@ -278,6 +278,9 @@
                 _show_warning(message, category, filename, lineno)
             else:
                 warn(showwarning_msg, DeprecationWarning)
+    if not callable(showwarning):
+        raise TypeError("warnings.showwarning() must be set to a "
+                        "function or method")
     # Print message and context
     showwarning(message, category, filename, lineno)