Python in a Nutshell

The operator Module

The operator module supplies functions that are equivalent to Python’s operators. These functions are handy for use with map and reduce, and in other cases where callables must be stored, passed as arguments, or returned as function results. The functions in operator have the same names as the corresponding special methods (covered in Chapter 5). Each function is available with two names, with and without the leading and trailing double underscores (e.g., both operator.add( a,b ) and operator.__add__( a,b ) return a + b). Table 15-1 lists the functions supplied by operator.

Table 15-1. Functions supplied by operator

Method	Signature	Behaves like
abs	abs(a)	abs( a )
add	add(a,b)	a + b
and_	and_(a,b)	a & b
concat	concat(a,b)	a + b
contains	contains(a,b)	b in a
countOf	countOf(a,b)	a .count( b )
delitem	delitem(a,b)	del a [ b ]
delslice	delslice(a,b,c)	del a [ b:c ]
div	div(a,b)	a / b
getitem	getitem(a,b)	a [ b ]
getslice	getslice(a,b,c)	a [ b:c ]
indexOf	indexOf(a,b)	a .index( b )
invert, inv	invert( a ), inv( a )	~ a
lshift	lshift(a,b)	a << b
mod	mod(a,b)	a % b
mul	mul(a,b)	a * b
neg	neg(a)	- a
not_	not_(a)	not a
or_	or_(a,b)	a | b
pos	pos(a)	+ a
repeat	repeat(a,b)	a * b
rshift	rshift(a,b)	a >> b
setitem	setitem(a,b,c)	a [ b ]= c
setslice	setslice(a,b,c,d)	a [ b:c ]= d
sub	sub(a,b)	a