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Possible Duplicate:
Python list confusion
I’ve got one little question about Python lists:
Why does this happen?
x = [[]] * 4
x[0].append('x') -> [['x'], ['x'], ['x'], ['x']]
the same instance of
[]is being duplicated, so when you append to the first one'x', you actually append it to all – because they are all the same object!The right way to do it is to explicitly create a new list instance each time: