New submission from STINNER Victor <victor.stin...@gmail.com>:
The -X dev mode currently *hides* some ResourceWarning warnings:
$ cat x.py
def func():
open('/etc/issue')
func()
func()
$ ./python x.py
x.py:2: ResourceWarning: unclosed file <_io.TextIOWrapper name='/etc/issue'
mode='r' encoding='UTF-8'>
open('/etc/issue')
x.py:2: ResourceWarning: unclosed file <_io.TextIOWrapper name='/etc/issue'
mode='r' encoding='UTF-8'>
open('/etc/issue')
haypo@selma$ ./python -X dev x.py
x.py:2: ResourceWarning: unclosed file <_io.TextIOWrapper name='/etc/issue'
mode='r' encoding='UTF-8'>
open('/etc/issue')
The problem is that the "-W default" inserted by -X dev overrides the final
filter on ResourceWarning:
$ ./python -X dev -c 'import warnings, pprint; pprint.pprint(warnings.filters)'
[('default',
re.compile('', re.IGNORECASE),
<class 'Warning'>,
re.compile(''),
0),
('ignore', None, <class 'BytesWarning'>, None, 0),
('always', None, <class 'ResourceWarning'>, None, 0)]
----------
messages: 306548
nosy: ncoghlan, serhiy.storchaka, vstinner
priority: normal
severity: normal
status: open
title: In developer mode (-X dev), ResourceWarning is only emited once per line
numbers
versions: Python 3.7
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32089>
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