Unintended output

[micseydel]

Check out this example of code with a similar issue

>>> t = [[None] *2] *5
>>> t
[[None, None], [None, None], [None, None], [None, None], [None, None]]
>>> t[0][0] = 1
>>> t
[[1, None], [1, None], [1, None], [1, None], [1, None]]