all Python 3Exceptionsexception

Warning

built-in exceptions

Base class for all warning categories (usually shown, not raised).

Syntax

raise Warning

Warning inherits from Exception, so category=Warning in warnings.filterwarnings matches every warning category at once, and a broad except Exception will swallow a warning that a filter turned into an error. The class itself is rarely used directly: pick UserWarning for messages aimed at the caller and DeprecationWarning for obsolete API — the latter is hidden by default everywhere except code running as __main__.

Examples

try:
    raise Warning
except Warning as e:
    print(type(e).__name__)   # → Warning

See also

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