Python Library Reference
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2.1.3 Comparisons
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2.1 Built-in Types
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2.1.1 Truth Value Testing
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 e.g.
not a == b
is interpreted as
not(a == b)
, and
a == not b
is a syntax error.
Python Library Reference
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2.1.3 Comparisons
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2.1.1 Truth Value Testing
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