Are Class variables mutable? [duplicate]

Question

If I define a simple class

class someClass():
    var = 1

x = someClass()
someClass.var = 2

This will make x.var equal 2. This is confusing to be because normally something akin to this like:

a = 1
b = a
a = 2

will leave b intact as b==1. So why is this not the same with class variables? Where is the difference? Can call all class variables mutable? In a way the class variables work more like assigning a list to a=[1] and doing a[0]=2.

Basically the problem is how is x.var acessing someClass.var it must be something different then is used when two variables are set equal in python. What is happening?

Answer 1

var is a static class variable of someClass.

When you reach out to get x.var, y.var or some_other_instance.var, you are accessing the same variable, not an instance derived one (as long as you didn't specifically assigned it to the instance as a property).