Python 3.14+operatorfunction

operator.is_not_none

identity and logic

Returns a is not None — functional form of the "value is set" check; handy as a predicate for filter(). Added in Python 3.14.

Syntax

operator.is_not_none(a)

Unlike filter(None, xs), filter(operator.is_not_none, xs) keeps 0, empty strings and False — it drops None only. That is a common mistake when cleaning data where zero is a legitimate value. Before 3.14 partial(operator.is_not, None) gives the same predicate.

Examples

import operator
f = getattr(operator, 'is_not_none', lambda a: a is not None)  # 3.14+ или аналог
print(f(None))                              # → False
print(f(0))                                 # → True
print(list(filter(f, [1, None, 2, None])))  # → [1, 2]
print([f(x) for x in ('', None, 0)])        # → [True, False, True]

See also

Common errors

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