3.10 `operator` -- Standard operators as functions.

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)
invert(o)
__inv__(o)
__invert__(o): Return the bitwise inverse of the number o. The names invert() and __invert__() were added in Python 2.0.

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.

xor(a, b)
__xor__(a, b): Return the bitwise exclusive or of a and b.

not_(o)
__not__(o): Return the outcome of not o. (Note that there is no __not__() method for object instances; only the interpreter core defines this operation.)

truth(o): Return 1 if o is true, and 0 otherwise.

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.

contains(a, b)
__contains__(a, b): Return the outcome of the test b in a. Note the reversed operands. The name __contains__() was added in Python 2.0.

sequenceIncludes(...): Deprecated since release 2.0. Use contains() instead.
Alias for contains().

countOf(a, b): Return the number of occurrences of b in a.

indexOf(a, b): Return the index of the first of occurrence of b in a.

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.

The operator also defines a few predicates to test the type of objects. Note: Be careful not to misinterpret the results of these functions; only isCallable() has any measure of reliability with instance objects. For example:

>>> class C:
... pass
... 
>>> import operator
>>> o = C()
>>> operator.isMappingType(o)
1

isCallable(o): Deprecated since release 2.0. Use the callable() built-in function instead.
Returns true if the object oCan be called like a function, otherwise it returns false. True is returned for functions, bound and unbound methods, class objects, and instance objects which support the __call__() method.

isMappingType(o): Returns true if the object o supports the mapping interface. This is true for dictionaries and all instance objects. Warning: There is no reliable way to test if an instance supports the complete mapping protocol since the interface itself is ill-defined. This makes this test less useful than it otherwise might be.

isNumberType(o): Returns true if the object o represents a number. This is true for all numeric types implemented in C, and for all instance objects. Warning: There is no reliable way to test if an instance supports the complete numeric interface since the interface itself is ill-defined. This makes this test less useful than it otherwise might be.

isSequenceType(o): Returns true if the object o supports the sequence protocol. This returns true for all objects which define sequence methods in C, and for all instance objects. Warning: There is no reliable way to test if an instance supports the complete sequence interface since the interface itself is ill-defined. This makes this test less useful than it otherwise might be.

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)

Subsections

3.10.1 Mapping Operators to Functions

See About this document... for information on suggesting changes.

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