diff options
Diffstat (limited to 'Lib/warnings.py')
| -rw-r--r-- | Lib/warnings.py | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Lib/warnings.py b/Lib/warnings.py index d9e6e44587..132a34da28 100644 --- a/Lib/warnings.py +++ b/Lib/warnings.py @@ -278,6 +278,9 @@ def warn_explicit(message, category, filename, lineno, _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) |