Bugs item #1191104, was opened at 2005-04-27 15:55
Message generated for change (Comment added) made by vsajip
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1191104&group_id=5470
Category: Python Library
Group: None
>Status: Closed
>Resolution: Invalid
Priority: 5
Submitted By: Ivan Vilata i Balaguer (ivilata)
Assigned to: Vinay Sajip (vsajip)
Summary: Warning ``error`` filter action is ignored.
Initial Comment:
Hi all. It seems that setting the ``error`` action on
a warning message once it has already been triggered
does not allow it to be triggered again. As usual, the
code is clearer than the explanation::
import warnings
def do_warn():
warnings.warn("A warning.", DeprecationWarning)
do_warn()
warnings.filterwarnings('error',
category=DeprecationWarning)
do_warn()
warnings.filterwarnings('always',
category=DeprecationWarning)
do_warn()
The output of this program is::
nowarn.py:4: DeprecationWarning: A warning.
warnings.warn("A warning.", DeprecationWarning)
There is no exception raised, though the filter was
instructed to turn the warning into an error. Take
note that using ``always`` has similar results.
Does it work in that way on purpose? I find it quite
counterintuitive, IMHO. If this behaviour is intended,
what would be the way to turn the second warning into
an exception?
Thanks!
----------------------------------------------------------------------
>Comment By: Vinay Sajip (vsajip)
Date: 2005-04-29 08:17
Message:
Logged In: YES
user_id=308438
This does not appear to be a bug. For example, the following
script (indentation may get messed up):
#--------------------------------------
import sys, warnings
def do_warn():
fn = sys.modules["__main__"].__file__
warnings.warn_explicit("A warning.", DeprecationWarning,
fn, 0)
def main():
do_warn()
warnings.filterwarnings('error',
category=DeprecationWarning)
try:
do_warn()
except Exception, e:
print "exception handled: %s" % e
warnings.filterwarnings('always',
category=DeprecationWarning)
do_warn()
if __name__ == "__main__":
main()
#--------------------------------------
prints
C:\temp\nowarn.py:0: DeprecationWarning: A warning.
exception handled: A warning.
C:\temp\nowarn.py:0: DeprecationWarning: A warning.
So the problem is that if you want explicit warnings, you
need to use warn_explicit() rather than warn().
----------------------------------------------------------------------
You can respond by visiting:
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1191104&group_id=5470
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