about 8 years ago
UPDATE: A video tutorial of this post has been created by webucator. They also offer a set of Python online training classes.
Thanks to this SO post, here are the ways to shallow and deep copy lists in Python:
Shallow Copy (from fastest to slowest)
new_list = old_list[:]
new_list = []
new_list.extend(old_list)
new_list = list(old_list)
import copy
new_list = copy.copy(old_list)
new_list = [i for i in old_list]
new_list = []
for i in old_list:
new_list.append(i)
Deepcopy (the slowest)
import copy
new_list = copy.deepcopy(old_list)
