Python ???????

Question

For shallow copy which one is the ideal method.
lis=[1,2,3,4]
lis2= lis.copy()
OR
import copy
lis2 = copy.copy(lis)

Answer 1

Python 2 will expire soon anyway.

Nonetheless, there are other simple ways to make a shallow copy:

lis2 = list(lis1)
lis2 = lis1[:]
lis2 = [n for n in lis1]

Answer 2

When you can do something just using what the builtin types easily provide, it seems sensible to use just these.

Answer 3

HonFu lis.copy() works in python3 only