How to inspect the warnings filter?

Question

In python, it is possible to change the way warnings are handled by working with the Warnings Filter. For example, one can add a filter specification to the warnings filter by calling warnings.simplefilter, by working with the PYTHONWARNINGS environment variable, or by using the -W command-line flag.

How can I inspect the current state of the warnings filter to see what warnings will be filtered, turned into error messages, etc?

Answer 1

The warnings module maintains a global variable filters.

>>> import warnings
>>> warnings.filters
[('default', None, <class 'DeprecationWarning'>, '__main__', 0),
('ignore', None, <class 'DeprecationWarning'>, None, 0),
('ignore', None, <class 'PendingDeprecationWarning'>, None, 0),
('ignore', None, <class 'ImportWarning'>, None, 0),
('ignore', None, <class 'ResourceWarning'>, None, 0)]

FWIW, I found this by looking at the code for warnings.filterwarnings, which, via _add_filter(), references a filters global variable imported from the C module _warnings.