Passing Values Between Class And Instance

class MyClassA(object): def __init__(self): entry = input('Insert a value ::: ') b = MyClassB(entry) #To pass the variable entry to class MyClassB c = M

Solution 1:

The problem you're having is because there are two independent instances of MyClassC being created, one in MyClassA.__init__() and a separate one in MyClassB.__init__().

The easy way to fix it — not necessarily the best — would be to make MyClassB.__init__() store the MyClassC instance it creates in yet another instance attribute, and then refer to the attribute of that object when you want to retrieve the value of p.

Here's what I mean:

class MyClassA(object):
    def __init__(self):
        entry = input("Insert a value ::: ")
        b = MyClassB(entry)  # To pass the variable entry to class MyClassB
####### c = MyClassC()  # Initializied MyClassC to be ready for receive the value p
        self.x = b.f  # To get back the value f from MyClassB
        print(self.x)
        self.x1 = b.c.p  # To get back the value p from MyClassC instance created in MyClassB
        print(self.x1)

class MyClassB(object):
    def __init__(self, M):
        self.f = M * 10  # f will contain (the value entry from MyClassA *10)
        self.c = MyClassC(self.f)  # Pass variable f to class MyClassC and save instance

class MyClassC(object):
    def __init__(self, passedVar):
        self.p = passedVar + 0.1 # p will contain (the value entry from MyClassB + 0.1)

h = MyClassA()

Solution 2:

In line

 c = MyClassC()

it should be

 c = MyClassC(b.f)

Solution 3:

Or you could set the value p to the class MyClassC

class MyClassC(object):
    def __init__(self, passedVar):
        MyClassC.p = passedVar + 0.1 

but keep in mind that this situation can happen

class T(object):

    def __init__(self, x):
        T.x = x
if __name__ == '__main__':
    t1 = T(3)
    print t1.x, T.x
    t1.x = 1
    print t1.x, T.x
    t2 = T(2)
    print t1.x, t2.x, T.x
# output: 
3 3
1 3
1 2 2