New submission from Thomas Gläßle <[email protected]>:
Hi,
This command does not report a warning, while it should:
python -c 'import warnings; warnings.warn("This should show up")' -Wi
-W'default:::.*'
If the regex `.*` is replaced by `__main__` it works as expected.
Same applies for regexes in PYTHONWARNINGS and for the `message` part of the
argument.
The reason can be found in Lib/warnings.py:144 (def _setoption):
module = re.escape(module)
This point-blank escape makes me think that it was intended that no regexes can
be passed to message/module. On the other, the documentation reads as if it
should be supported.
Specifically, the -W option is documented in [1]. While this page lists only
basic examples, it refers to [2] and [3] for more details. [2] states that
message/module are regexes. [3] seems to be written to specifically address the
syntax of the PYTHONWARNINGS and the -W option and explicitly lists an example
with a regex.
[1]: https://docs.python.org/3/using/cmdline.html#cmdoption-w
[2]: https://docs.python.org/3/library/warnings.html#warning-filter
[3]: https://docs.python.org/3/library/warnings.html#describing-warning-filters
I would welcome if we could remove `re.escape` to make the implementation fit
the documentation, or are there any downsides to this?
Best regards, Thomas
----------
components: Library (Lib)
messages: 324959
nosy: coldfix
priority: normal
severity: normal
status: open
title: -W option does not accept module regexes
versions: Python 3.6, Python 3.7, Python 3.8
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Python tracker <[email protected]>
<https://bugs.python.org/issue34624>
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