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def shift(lst):
    lst2 = lst
    for i in range(len(lst)):
        lst[i] = lst2[i-1]
    return lst

def main():
    lst = [1,2,3,4,5]
    print(lst)
    print(shift(lst))
main()

This prints: lst = [1,2,3,4,5] lst2 = [5,5,5,5,5]

I'm trying to shift the values of list backwards by one step but every time it ends up changing both lists(lst,lst2) instead of only the original list(lst) why is that?

Keanu
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    Because `lst2 = lst` doesn't take a copy but just assigns a new name for `lst`. Do `lst2 = lst.copy()` if you want a new copy. – AKX Nov 29 '22 at 07:49

0 Answers0