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Python Pocket Reference, 4th Edition by Mark Lutz

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Built-in Types and Operators

Operators and Precedence

Table 1-1 lists Python’s expression operators. Operators in the lower cells of this table have higher precedence (i.e., bind tighter) when used in mixed-operator expressions without parentheses.

Table 1-1. Python 3.0 expression operators and precedence

Operator

Description

yield X

Generator function send() protocol

lambda args: expr

Anonymous function maker

X if Y else Z

Ternary selection (X is evaluated only if Y is true)

X or Y

Logical OR: Y is evaluated only if X is false

X and Y

Logical AND: Y is evaluated only if X is true

not X

Logical negation

X in Y, X not in Y

Membership: iterables, sets

X is Y, X is not Y

Object identity tests

X < Y, X <= Y, X > Y, X >= Y

Magnitude comparisons, set subset and superset

X == Y, X != YEquality operators

X | Y

Bitwise OR, set union

X ^ Y

Bitwise exclusive OR, set symmetric difference

X & Y

Bitwise AND, set intersection

X << Y, X >> Y

Shift X left, right by Y bits

X + Y, X – Y

Addition/concatenation, subtraction/set difference

X * Y, X % Y,

X / Y, X // Y

Multiplication/repetition, remainder/format, division, floor division

-X, +X

Unary negation, identity

˜X

Bitwise NOT complement (inversion)

X ** Y

Power (exponentiation)

X[i]

Indexing (sequence, mapping, others)

X[i:j:k]

Slicing (all bounds optional)

X(...)

Call (function, method, class, other callable)

X.attr

Attribute reference

(...)

Tuple, expression, generator expression

[...]

List, list comprehension

{...}

Dictionary, set, dictionary and set comprehension

Operator Usage Notes

  • In Python 2.6, ...

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