Why 2 why not 1?

Question

Class A:
x=0
def func(obj):
obj.x=2
return obj
a=A()
a.x=1
b=func(a)
print (a.x)

Answer 1

what 'func(a)' does is take 'a' and assign its attribute x=2 in the instance 'a'. So when you print (a.x) the result is 2.

When you pass a object as a parameter in a function, you can modify their attributes