Python: is it possible to link two variable belonging to two different classes?

Question

I would like to connect two variables totwo different classes but I don't know if what I'm trying to do is possible or not.

for instance, if I have those two classes:

class one():
    def __init__(self):
        self.a = 0
    def compute(self):
        self.a = self.a + 1


class two():
    def __init__(self):
        self.a = 0
        self.C_one = one()
        self.link()

    def link(self):
        self.a = self.C_one.a

    def compute(self):
        self.C_one.compute()
        print('C_one a=',self.C_one.a )
        print('C_two a=',self.a )

C_two = two()
for i in range(5):
    C_two.compute()

In the class two I would like connect the variable a with the variable a of class one, so I don't have to explicitly call self.a = self.C_one.a each time I execute C_two.compute

The code in example give me this:

C_one a= 1
C_two a= 0
C_one a= 2
C_two a= 0
C_one a= 3
C_two a= 0
C_one a= 4
C_two a= 0
C_one a= 5
C_two a= 0

Which is not the result I expect. Somebody know if I can do that in python?

update

From the example below

class one():
    def __init__(self):
        self.a = 0
    def compute(self):
        self.a = self.a + 1


class two():
    def __init__(self):
        self.a = 0

class three():
    def __init__(self):
        self.C_one = one()
        self.C_two = two()
        self.b = 0

    def compute(self):
        self.C_one.compute()
        #self.C_two.a = self.C_one.a
        print('C_one a=',self.C_one.a )
        print('C_two a=',self.C_two.a )

C_three = three()
for i in range(5):
    C_three.compute()

is it possible to use the answer of deceze and replace the commented line #self.C_two.a = self.C_one.awith a property ? Like that classes one and two are linked in the class three.

answer from deceze

class one():
    def __init__(self):
        self.a = 0
    def compute(self):
        self.a = self.a + 1


class two():
    def __init__(self,one): 
        self.C_one = one

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

class three():
    def __init__(self):
        self.C_one = one()
        self.C_two = two(self.C_one)
        self.b = 0

    def compute(self):
        self.C_one.compute() 
        print('C_one a=',self.C_one.a )
        print('C_two a=',self.C_two.a )

C_three = three()
for i in range(5):
    C_three.compute()

Answer 1

Define two.a as a property:

class two:
    def __init__(self):
        self.C_one = one()

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

    ...