I want to update a copied list but when I do that it updates both the original and copied one
b=[1,2,3]
a=b
a[0]=2
print(a)
print(b)
but the value of b changed and became [2,2,3]
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To perform a copy use `a=b[:]` – Pedro Maia Nov 29 '21 at 13:47
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`a=b` is **not** a copy. – jonrsharpe Nov 29 '21 at 13:47
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`a = b.copy()` in this case but if you have nested lists use `import copy; a = copy.deepcopy(b)` – Ch3steR Nov 29 '21 at 13:47
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thank u that's a suitable answer – Peter Nagy Nov 29 '21 at 13:56