Python Library Reference

Next: 2.1.3 Comparisons Up: 2.1 Built-in Types Previous: 2.1.1 Truth Value Testing

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2.1.2 Boolean Operations

These are the Boolean operations, ordered by ascending priority:

Operation	Result	Notes
x or y	if x is false, then y, else x	(1)
x and y	if x is false, then x, else y	(1)
not x	if x is false, then 1, else 0	(2)

Notes:

(1)

These only evaluate their second argument if needed for their outcome.

(2)

"not" has a lower priority than non-Boolean operators, so not a == b is interpreted as not (a == b), and a == not b is a syntax error.

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Python Library Reference

Next: 2.1.3 Comparisons Up: 2.1 Built-in Types Previous: 2.1.1 Truth Value Testing