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
Ned Deily added the comment:
The problem you describe was covered by Issue4180 and fixed in Python 3.4.2.
From the discussion there, you can see that it was decided to not change the
behavior of Python 2.7.
--
nosy: +ned.deily
resolution: - duplicate
stage: - resolved
status: open
