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Issue #23016: A warning no longer produces an AttributeError when the program

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is run with pythonw.exe.
This commit is contained in:
Serhiy Storchaka 2014-12-10 23:04:47 +02:00
commit 927131e050
3 changed files with 15 additions and 0 deletions
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3
Lib/warnings.py
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@ -11,6 +11,9 @@ def showwarning(message, category, filename, lineno, file=None, line=None):
"""Hook to write a warning to a file; replace if you like."""
if file is None:
file = sys.stderr
if file is None:
# sys.stderr is None when ran with pythonw.exe - warnings get lost
return
try:
file.write(formatwarning(message, category, filename, lineno, line))
except OSError: