Name: Anonymous 2011-06-04 13:01
>>> l = [[0]] * 2
>>> l
[[0], [0]]
>>> l[0][0] = 1
>>> l
[[1], [1]]
>>> l = [[0]] * 2
>>> l
[[0], [0]]
>>> l[0][0] = 1
>>> l
[[1], [1]]
RuntimeError: maximum recursion depth exceeded