[issue20131] warnings module offers no documented, programmatic way to reset "seen-warning" flag

[Catherine Devlin]

Catherine Devlin  added the comment:

I think that it's possible to get the desired behavior by setting a filter to 
"always".

```
> cat warnme.py 
import warnings

for i in range(3):
warnings.warn("oh noes!")

> python warnme.py 
warnme.py:4: UserWarning: oh noes!
warnings.warn("oh noes!")

> cat warnme2.py 
import warnings

warnings.simplefilter("always")
for i in range(3):
warnings.warn("oh noes!")

> python warnme2.py 
warnme2.py:5: UserWarning: oh noes!
warnings.warn("oh noes!")
warnme2.py:5: UserWarning: oh noes!
warnings.warn("oh noes!")
warnme2.py:5: UserWarning: oh noes!
warnings.warn("oh noes!")
```

Does that meet the need?

--
nosy: +Catherine.Devlin

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[issue20131] warnings module offers no documented, programmatic way to reset "seen-warning" flag

[Irit Katriel]

Change by Irit Katriel :


--
resolution:  -> duplicate
superseder:  -> warnings module offers no documented, programmatic way to reset 
"seen-warning" flag

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[issue20131] warnings module offers no documented, programmatic way to reset "seen-warning" flag

[Brett Cannon]

Change by Brett Cannon :


--
nosy:  -brett.cannon

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[issue20131] warnings module offers no documented, programmatic way to reset "seen-warning" flag

[Terry J. Reedy]

Changes by Terry J. Reedy :


--
stage:  -> test needed

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[issue20131] warnings module offers no documented, programmatic way to reset "seen-warning" flag

[R. David Murray]

R. David Murray added the comment:

The easy answer for unittest is to use assertWarns.  For versions where that 
doesn't exist you could implement the same technique yourself.  Exposing a 
'clear everything' function in the warnings module might not be a bad idea, but 
otherwise for doctest I'd think the catch_warnings context manager would be the 
correct answer, and that is documented.

Given the above, I guess this issue is a request to expose a "clear everything" 
function in the warnings module, which I think is a reasonable idea.

(I think it would be nice to add some support stuff to doctest to make things 
like this easier, but that is a totally separate issue.)

--
nosy: +brett.cannon, r.david.murray
versions: +Python 3.5 -Python 2.7, Python 3.4

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[issue20131] warnings module offers no documented, programmatic way to reset "seen-warning" flag

[Andreas Kloeckner]

New submission from Andreas Kloeckner:

For tests and doctests, it is often desirable to show or verify that a certain 
warning occurs. Unfortunately, if the warning has been hit previously, it will 
not be issued again. It would be great if there were a documented, unified way 
to reset this 'seen' flag.

Related stackoverflow posts showing that I'm not the first person to have this 
need:

* 
https://stackoverflow.com/questions/19428761/python-showing-once-warnings-again-resetting-all-warning-registries
* https://stackoverflow.com/questions/2418570/testing-warnings-with-doctest

Neither of these has a satisfactory solution.

--
components: Library (Lib)
messages: 207372
nosy: inducer
priority: normal
severity: normal
status: open
title: warnings module offers no documented, programmatic way to reset 
"seen-warning" flag
versions: Python 2.7, Python 3.4

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[issue20131] warnings module offers no documented, programmatic way to reset "seen-warning" flag

[Andreas Kloeckner]

Changes by Andreas Kloeckner :


--
type:  -> enhancement

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