Changing a variable's value inside a class in python

Question

I have a variable:

var_1 = 5

I pass it to a class:

class x():
 def __init__(self, val):
 self.class_var_1 = val
object_1 = x(var_1)

I want to change var_1's value using class x, but it won't change

object_1.class_var_1 = 3
print var_1
5

var_1 isn't copied to object_1.class_var_1 with a reference to var_1.

How do I change var_1's value by changing object_1.class_var_1's value?

• anon582847382: You can't. Integers are immutable.

Answer 1

Python int is immutable. The object can never change its value. Thus you need to re-bind the name to a different object. You'll need code like this:

var_1 = ...

Substitute whatever you like on the right hand side.

• alwbtc: Ok, what if it is not a int but a bool?
• David Heffernan: If you are interested in booleans, why did you ask about int. But as it happens, Python booleans are also immutable.
• alwbtc: I didnt know it would matter.
• anon582847382: @alwbtc Booleans are immutable as well.
• Samy Arous: you can use a mutable object like a list (even if it contains one single int) or a custom object.