Hi, I thought that x += ... was the same than x = x + ..., but today I have realized it is not true when operating with mutable objects.
In Python 3.3 or 2.7 IDLE (Windows) compare: >>> a = [3] >>> b = a >>> a = a + [1] >>> b [3] and >>> a = [3] >>> b = a >>> a += [1] >>> b [3, 1] Is this behaviour explained in the Python documentation? Thanking you in advance, Bartolomé Sintes -- http://mail.python.org/mailman/listinfo/python-list
