[New-bugs-announce] [issue24490] DeprecationWarning hidden even after warnings.filterwarnings('always') called

[Jakub Mateusz Kowalski]

New submission from Jakub Mateusz Kowalski:

The error occurs when there was a warning before the call to filterwarnings():

$ python
Python 2.7.6 (default, Mar 22 2014, 22:59:56) 
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import warnings
>>> warnings.warn('aa', DeprecationWarning)
>>> warnings.filterwarnings('always')
>>> warnings.warn('aa', DeprecationWarning)
>>>

When filterwarnings() is called before warnings, everything is working as expected:

$ python
Python 2.7.6 (default, Mar 22 2014, 22:59:56) 
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import warnings
>>> warnings.filterwarnings('always')
>>> warnings.warn('aa', DeprecationWarning)
__main__:1: DeprecationWarning: aa
>>> warnings.warn('aa', DeprecationWarning)
__main__:1: DeprecationWarning: aa
>>>

----------
components: Interpreter Core
messages: 245691
nosy: Jakub.Mateusz.Kowalski
priority: normal
severity: normal
status: open
title: DeprecationWarning hidden even after warnings.filterwarnings('always') called
type: behavior
versions: Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24490>
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