Martin v. Löwis added the comment:
This is not a bug. extend is a procedure with a side effect: the "self" object
(i.e. "a" in your example) is modified.
By convention, procedures return None in Python, as opposed to functions, which
have no side effect but return a result. This is to avoid co
New submission from laki:
Python 2.7.3 (default, Apr 10 2012, 23:24:47) [MSC v.1500 64 bit (AMD64)] on
win32
>>> a = [1,2]
>>> b = [2,3]
>>> a.extend(b)
>>> a
[1, 2, 2, 3]
>>> print [1,2].extend([2,3])
None
I did not test this in linux.
--
components: Windows
messages: 167859
nosy: lak
