On Tue, May 31, 2011 at 3:14 PM, Martin Manns <mma...@gmx.net> wrote: > $ python > Python 2.6.6 (r266:84292, Apr 20 2011, 11:58:30) > [GCC 4.5.2] on linux2 > Type "help", "copyright", "credits" or "license" for more information. >>>> fs=[] >>>> fs = [(lambda n: i + n) for i in range(10)] >>>> [fs[i](1) for i in range(10)] > [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
This works by accident. >>> [fs[i](1) for i in range(10)] [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] >>> [fs[0](1) for i in range(10)] [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] >>> [f(1) for f in fs] [10, 10, 10, 10, 10, 10, 10, 10, 10, 10] The i variable is part of the global scope, and as you iterate over range(10) again it coincidentally takes on the same values as in the original list comprehension. You don't see this in Python 3 because the scope of i is limited to the list comprehension, not global. Cheers, Ian -- http://mail.python.org/mailman/listinfo/python-list
