Problem with assignment of a module variable in a class function

Question

How can I assign a copy of a module variabile in the class function?
When I assign this module variable to the class function as self.variable = variable, the module variable is also changed when I make changes with self.variable.

Answer 1

I am not sure if I understand you right but if you have mutable variables like a list. You can use the copy command like that:

a = [1,2,3]
b = a.copy()
b[1] = 5
print(a, b)

Btw. if you write class methods, it's a good idea to write cls instead of self. Like here:

https://www.sololearn.com/learn/o-JUMP_LINK__&&__Python__&&__JUMP_LINK/2473/?ref=app

Answer 2

It would be helpful to show your code, how the class is coded, how you use it and give example of inputs and expected outputs.

Answer 3

# Hi Giovanni Paolo Balestriere,

# If your object that you want to copy contains mutable objects,
# such as a list within a list, and you want to completely decouple
# it from external changes, use deepcopy from the copy module:

import copy

a = [1, 2]
b = [5, 6, [a]]

c = b.copy()
d = copy.deepcopy(b)

b[1] = 77
a.append(99)

print(f"{a = }")
# -> a = [1, 2, 99]

print(f"{b = }")
# -> b = [5, 77, [[1, 2, 99]]]

print(f"{c = }")
# -> c = [5, 6, [[1, 2, 99]]]

print(f"{d = }")
# -> d = [5, 6, [[1, 2]]]

# https://sololearn.com/compiler-playground/cZtHpXIeJXO7/?ref=app