Increment class property attribute in setter

Question

I understand the concept of getter/setter in python. The thing I am not able to understand is, I need to add new value to the variable itself and I am not sure how I can achieve this with @property decorator.

The old code instantiates some variables and self increment them. I am trying to refactor the code and move those variables to a class and add @property/setter so that I can access them as attributes.

Old Code:

class ExistingCode(object):
   a = 0
   b = 0
   c = 0
   d = 0

   bunch of other code..

   a += 12
   b += 12
   c += 12
   d += 12

What I am trying to do is:

class Variables(object):
   def __init__(self):
        a = 0
        b = 0
        c = 0
        d = 0

    @property
    def a(self):
        return self.a

    @a.setter
    def a(self, x)
        a = x

    ......

I am getting "RuntimeError: maximum recursion depth exceeded". Please help.

Answer 1

I found the issue. The main problem was that I was using the same name for the attribute and the property as mentioned by @martineau. Also, I missed self in many places. Below is the working example.

class Variables(object):
    def __init__(self):
        self.a = 0

    @property
    def a(self):
        return self.__a

    @a.setter
    def a(self, x):
        self.__a = x