15.2. The operator Module
The operator module supplies functions that are equivalent to Python's operators. These functions are handy in 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 "Special Methods" on page 104). Each function is available with two names, with and without leading and trailing double underscores (e.g., both operator.add(a,b) and operator._ _add_ _(a,b) return a+b). Table 151 lists the functions supplied by the operator module.
Table 151. Functions supplied by the operator moduleMethod  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  eq  eq(a,b)  a==b  floordiv  floordiv(a,b)  a//b  ge  ge(a,b)  a>=b  getitem  getitem(a,b)  a[b]  getslice  getslice(a,b,c)  a[b:c]  gt  gt(a,b)  a>b  indexOf  indexOf(a,b)  a.index(b)  invert, inv  invert(a), inv(a)  ~a  is  is(a,b)  a is b  is_not  is_not(a,b)  a is not b  le  le(a,b)  a<=b  lshift  lshift(a,b)  a<<b  lt  lt(a,b)  a<b  mod  mod(a,b)  a%b  mul  mul(a,b)  a*b  ne  ne(a,b)  a!=b  neg  neg(a)  a  not_  not_(a)  not a  or_  or_(a,b)  ab  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)  ab  truediv  truediv(a,b)  a/b # "true" div > no truncation  truth  truth(a)  not not a, bool(a)  xor_  xor(a,b)  a^b 
Module operator also supplies two higherorder functions whose results are functions suitable for passing as named argument key= to the sort method of lists, the sorted builtin function, and (in Python 2.5) other builtin functions such as min and max.
attrgetter  attrgetter(attr)
Returns a callable f such that f(o) is the same as getattr(o,attr).
 itemgetter  itemgetter(key)
Returns a callable f such that f(o) is the same as getitem(o,key).
For example, say that L is a list of lists, with each sublist at least three items long, and you want to sort L, inplace, based on the third item of each sublist. The simplest way is:
import operator L.sort(key=operator.itemgetter(2))

