3.5 Built-in Module operator

 

The operator module exports a set of functions implemented in C corresponding to the intrinsic operators of Python. For example, operator.add(x, y) is equivalent to the expression x+y. The function names are those used for special class methods; variants without leading and trailing "__" are also provided for convenience.

The operator module defines the following functions:

add (a, b)

__add__ (a, b)

Return a + b, for a and b numbers.

sub (a, b)

__sub__ (a, b)

Return a - b.

mul (a, b)

__mul__ (a, b)

Return a * b, for a and b numbers.

div (a, b)

__div__ (a, b)

Return a / b.

mod (a, b)

__mod__ (a, b)

Return a % b.

neg (o)

__neg__ (o)

Return o negated.

pos (o)

__pos__ (o)

Return o positive.

abs (o)

__abs__ (o)

Return the absolute value of o.

inv (o)

__inv__ (o)

Return the inverse of o.

lshift (a, b)

__lshift__ (a, b)

Return a shifted left by b.

rshift (a, b)

__rshift__ (a, b)

Return a shifted right by b.

and_ (a, b)

__and__ (a, b)

Return the bitwise and of a and b.

or_ (a, b)

__or__ (a, b)

Return the bitwise or of a and b.

concat (a, b)

__concat__ (a, b)

Return a + b for a and b sequences.

repeat (a, b)

__repeat__ (a, b)

Return a * b where a is a sequence and b is an integer.

getitem (a, b)

__getitem__ (a, b)

Return the value of a at index b.

setitem (a, b, c)

__setitem__ (a, b, c)

Set the value of a at index b to c.

delitem (a, b)

__delitem__ (a, b)

Remove the value of a at index b.

getslice (a, b, c)

__getslice__ (a, b, c)

Return the slice of a from index b to index c-1.

setslice (a, b, c, v)

__setslice__ (a, b, c, v)

Set the slice of a from index b to index c-1 to the sequence v.

delslice (a, b, c)

__delslice__ (a, b, c)

Delete the slice of a from index b to index c-1.

Example: Build a dictionary that maps the ordinals from 0 to 256 to their character equivalents.

>>> import operator
>>> d = {}
>>> keys = range(256)
>>> vals = map(chr, keys)
>>> map(operator.setitem, [d]*len(keys), keys, vals)