__init__ function arguments

[CoderMan]

Hello,

I am trying to make an __init__ function's argument be the previous argument of that function divided by 2.

class item:
    def __init__(self,value1,value2):
        self.v1 = value1
        self.v2 = value2

x = item(10,item.v1/2)

However, when I run it I get the message that "type object 'item' has no attribute v1".

Any other ways to do it?