Function in Python

Question

How to transfer a list to the function, to change it in the function, it did not change beyond the function?

Answer 1

You can use list slicing to get a different copy of the original list;

a = [1, 2, 3]
b = a[:]

b[0] = 4
print(a[0]) #1

Hence, in a function:

def f(lst):
lst2 = lst[:]
lst2[0] = 4
return lst2

Therefore if you pass a list to the function the original list will be the same.

(I think, I haven't done Python in a long time)