Thanks,
my problem was the following :
list=[1,2] i wanted to copy list into another list: list2=list correct way to do this is : list2=list[:]
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You should use some more brackets, otherwise the boolean equation is solved linearly, and you will not get the result you expect (according to the `if`-`else`-part later). – arc_lupus Nov 24 '15 at 10:09
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r=d just makes r point to the same list as d. It does not make a copy. If you want to modify one without changing the other, you actually do need to make a copy. One way of doing this would be to do
r = d[:]
Daniel Roseman
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2@KevinGuan, I doubt an error would be *more clear* than `d[:]`, the OP is using python2 so you using python3 is pretty irrelevant to the question – Padraic Cunningham Nov 24 '15 at 10:25
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