Terry J. Reedy added the comment:
In 3.6, the code in question is
def _showwarnmsg_impl(msg):
file = msg.file
if file is None:
file = sys.stderr
if file is None:
# sys.stderr is None when run with pythonw.exe:
# warnings get lost
return
text = _formatwarnmsg(msg)
try:
file.write(text)
except OSError:
# the file (probably stderr) is invalid - this warning gets lost.
pass
When the write is attempted, *file* is not None. It can either be sys.stderr
or something else, successfully opened. If writing to sys.stderr fails, we
properly should give up.
If writing to something else fails, I now think we should try to write an
exception to stderr. So I thing the bug here, if any, is unconditionally
passing. Perhaps the exception clause should be replaced (in a new issue) with
something like
except (OSError, ValueError):
if msg.file is not sys.stderr:
raise
----------
resolution: -> not a bug
stage: test needed -> resolved
status: open -> closed
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<http://bugs.python.org/issue22298>
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