How to make a copy of a list of objects not change when modifying the original list? [duplicate]

Answer 1

Use deepcopy

Return a deep copy of x.

from copy import deepcopy

original_list = [Object1(), Object2(), Object3()]
copy_list = deepcopy(original_list)
original_list.pop()

But note that slicing will work faster in your case:

copy_list = original_list[:]

Answer 2

Use copy.deepcopy() for a deep copy:

import copy
copy_list = copy.deepcopy(original_list)

For a shallow copy use copy.copy():

import copy
copy_list = copy.copy(original_list)

or slice with no endpoints specified :

copy_list = original_list[:]

See the copy docs for an explanation about deep & shallow copies.

Answer 3

This will work.

import copy
copy_list = copy.copy(original_list)

Also

copy_list = list(original_list)