On 29 Ago, 17:00, Peter Otten <__pete...@web.de> wrote: > ernest wrote: > > The operator module provides separate functions for > > "in place" operations, such as iadd(), isub(), etc. > > However, it appears that these functions don't really > > do the operation in place: > > > In [34]: a = 4 > > > In [35]: operator.iadd(a, 3) > > Out[35]: 7 > > > In [36]: a > > Out[36]: 4 > > > So, what's the point? If you have to make the > > assignment yourself... I don't understand. > > Integers are immutable, and for instances a of immutable types > > a += b > > is equivalent to > > a = a + b > > For mutable types like list add() and iadd() may differ: > > >>> a = ["first"] > >>> operator.iadd(a, [42]) > ['first', 42] > >>> a > > ['first', 42] > > >>> a = ["first"] > >>> operator.add(a, [42]) > ['first', 42] > >>> a > > ['first']
It makes sense now. Thank you :) Ernest -- http://mail.python.org/mailman/listinfo/python-list
