On 01/09/2021 09:27, Steven D'Aprano wrote:
Maybe I'm missing something, but I don't think that there is anyway to
remove a warning from the warnings filter list so that it will be shown
again.
Example:
>>> import warnings
>>> warnings.warn("something happened")
<stdin>:1: UserWarning: something happened
>>> warnings.warn("something happened")
>>>
Once a warning has been displayed, it won't be displayed again until you
exit the interpreter and start a new session. That's usually what we
want, but sometimes I do want to re-display the warning.
The warnings module has a function, reset_warnings, but it does too
much, removing all the filters including those set at interpreter
startup. I'd like a function to remove a single item, something like
this:
>>> warnings.warn("something happened")
<stdin>:1: UserWarning: something happened
>>> warnings.warn("something happened")
>>>
>>> warnings.forget(UserWarning("something happened"))
>>> warnings.warn("something happened")
<stdin>:1: UserWarning: something happened
or similar.
Thoughts?
Instead of removing it you might add a filter to get a similar effect:
>>> import warnings
>>> def bark(): warnings.warn("woof!")
>>> bark()
Warning (from warnings module):
File "<pyshell#76>", line 1
UserWarning: woof!
>>> bark()
>>> warnings.filterwarnings("always", "woof!")
>>> bark()
Warning (from warnings module):
File "<pyshell#76>", line 1
UserWarning: woof!
>>> bark()
Warning (from warnings module):
File "<pyshell#76>", line 1
UserWarning: woof!
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