New submission from Oren Milman:
The following code causes an assertion failure in warn_explicit() (in
Python/_warnings.c):
import warnings
warnings.filters = [(None, None, Warning, None, 0)]
warnings.warn_explicit(message='foo', category=Warning, filename='bar',
lineno=1)
this is because warn_explicit() assumes that get_filter() returned a string,
and passes the return value (of get_filter()) to
_PyUnicode_EqualToASCIIString(),
which asserts it received a string.
In addition, get_filter() might return warnings.defaultaction, and so the
following code also causes an assertion failure in warn_explicit():
import warnings
warnings.defaultaction = None
warnings.filters = []
warnings.warn_explicit(message='foo', category=Warning, filename='bar',
lineno=1)
----------
components: Extension Modules
messages: 301867
nosy: Oren Milman
priority: normal
severity: normal
status: open
title: assertion failures in warn_explicit() in case of a bad warnings.filters
or warnings.defaultaction
type: crash
versions: Python 3.7
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Python tracker <[email protected]>
<https://bugs.python.org/issue31416>
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