all Python 3warningsfunction

warnings.resetwarnings()

filters

Removes every warning filter rule — the ones added in code, the ones set with -W, and the built-in defaults.

Syntax

warnings.resetwarnings()

The catch is "and the defaults": after a reset the filter list is empty, the 'default' action applies to everything, and DeprecationWarning and ImportWarning, normally hidden, suddenly show up. Whatever the user set via -W or PYTHONWARNINGS is gone too, so a library must never call it. To restore settings after temporary changes use catch_warnings(), not this.

Examples

import warnings
with warnings.catch_warnings():
    warnings.resetwarnings()
    print(warnings.filters)  # → []
print(len(warnings.filters) > 0)  # → True

import warnings
with warnings.catch_warnings(record=True) as caught:
    warnings.resetwarnings()
    warnings.warn('старый вызов', DeprecationWarning)
print(caught[0].category.__name__)  # → DeprecationWarning

See also

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