In article <[EMAIL PROTECTED]>, Tim Roberts <[EMAIL PROTECTED]> wrote: > >One thing that can be helpful in situations like this is to remember that >+= in Python isn't quite as "special" as it is in C. So, > > f() += [4] > >is the same as > > f() = f() + [4] > >and I think you can see why that is a problem.
Actually, it's not quite the same as the expansion, either: >>> a=[1] >>> b=a >>> a+=[2] >>> a is b 1 >>> a = a + [3] >>> a is b 0 >>> a [1, 2, 3] >>> b [1, 2] -- Aahz ([EMAIL PROTECTED]) <*> http://www.pythoncraft.com/ "19. A language that doesn't affect the way you think about programming, is not worth knowing." --Alan Perlis -- http://mail.python.org/mailman/listinfo/python-list
