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I created a list of lists:
>>> xs =
Then, I changed one of the innermost values:
>>> xs[0][0] = 5 >>> print(xs)
I expected this to only affect the first sublist, not all of them. That is:
>>> print(xs)
Why did every first element of every sublist change to 5?
See also:
-
How do I clone a list so that it doesn't change unexpectedly after assignment? and
How to initialize a two-dimensional array (list of lists, if not using NumPy) in Python? for workarounds for the problem
-
List of dictionary stores only last appended value in every iteration for an analogous problem with a list of dicts
How do I initialize a dictionary of empty lists in Python? for an analogous problem with a dict of lists
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