How can I change a variable in a child class so that its dependent variables can also be changed?-CodePudding

Does anyone know if it is even possible to change the inherited variables of the parent class by changing a variable in a child class? Without declaring them in the __init__ child?

class Foo(object):
    def __init__(self):
        self.data = "abc"
        self.data_2 = self.data

class Bar(Foo):
    def __init__(self):
        super(Bar, self).__init__()
        self.data = "def"

f = Foo()
b = Bar()

print(f.data_2)  # --> abc
print(b.data_2)  # --> abc

But I expect to get:

print(f.data_2)  # --> abc
print(b.data_2)  # --> def

CodePudding user response：

this solves the issue if you don't want to accept data as an argument to your init func as someone pointed out above

class Foo(object):
    def __init__(self):
        self.data = "abc"

    @property
    def data_2(self):
        return self.data

class Bar(Foo):
    def __init__(self):
        super(Bar, self).__init__()
        self.data = "def"

f = Foo()
b = Bar()

print(f.data_2)
print(b.data_2)