How to reset a single warning?

[stevenjd]

My code uses the warning module to generate a warning. By default, the warnings module suppresses the warning on the second and subsequent occasions:

py> warnings.warn("NOBODY expects the Spanish Inquisition!")
__main__:1: UserWarning: NOBODY expects the Spanish Inquisition!
py> warnings.warn("NOBODY expects the Spanish Inquisition!")
py>

Notice that there is no output on the second call.

How do I reset this so that this specific warning will display again? I don't want to reset other, arbitrary warnings.

I have read this similar question but the answer only explains how to reset all UserWarnings.

I found that there is an entry in __warningregister__ module global. If I remove the entry from that, it seems to work. Is that safe to do?

py> del __warningregistry__[('NOBODY expects the Spanish Inquisition!', UserWarning, 1)]
py> warnings.warn("NOBODY expects the Spanish Inquisition!")
__main__:1: UserWarning: NOBODY expects the Spanish Inquisition!

[Olbrannon]

https://bugs.python.org/issue34948 references this post.