Copying a Python list is tricky

copying_python_list.py

"""
hollyandprosper.com

YouTube Channel: https://www.youtube.com/@hollyandprosper
Link to the original YouTube Short: 

part 1: https://youtu.be/642mFCjpHxA
part 2: https://youtu.be/VFGaapH0gaQ
part 3: https://youtu.be/k0ekMw6u5wU
"""

# part 1 and 2 example

import copy
list_a = [["1", "2"], "3", "4"]
list_b = copy.deepcopy(list_a)
list_b[0].remove("1")
print(list_a)

print(id(list_a) == id(list_b))
print(id(list_a[0]) == id(list_b[0]))

# part 3 example

import copy

class Node:
    pass

list_a = [1, 2, "alpha", "beta", Node()]
list_b = copy.deepcopy(list_a)

for val_a, val_b in zip(list_a, list_b):
    print(id(val_a), id(val_b))

# 'alpha'[0] = 'A' 
# An error will be thrown.

answer = 42
print(id(answer))
answer += 1
print(id(answer))
# += actually creates a new object, which is counter-intuitive.