Declare objects as an attribute of another object in python

Question

I try to create a tree of objects / not classes. I mean i do not want to create relations between the objects in prototype level, but in instance level so the relations between the objects will be solved with the code.

Here i wrote something

class human :

    def  __init__ (self,Name,Surname,Gender,Age,Father,Mother) :

        self.Name = Name
        self.Surname = Surname
        self.Gender = Gender
        self.Age = Age
        self.Father = Father
        self.Mother = Mother

class family :

    def __init__ (self,Surname,Members) :

        self.Surname = Surname
        self.Members = Members

    def ListMembers (self) :

        for member in self.Members :

            print (self.Surname +' family member ' +member.Name + ' '+ member.Surname + ' is ' + member.Age + " years old ")


human1 = human( 'Mary','Walter','Female','42','Jason White','Sally White')
human2 = human('Charles', 'Walter', 'Male', '45', 'Samuel Ribbon', 'Angie Ribbon')
human3 = human('Claire', 'White', 'Female', '16', 'Charles Walter', 'Mary Walter')

WalterFamily = family('Walter',(human1,human2,human3))

WalterFamily.ListMembers

When i run this code WalterFamily.ListMembers prints nothing.

What is exact way of nesting objects in another object ? Like i tried to do here : Nesting 3 humans inside a family and also reach to the attributes of these objects..

Answer 1

The last line of code is not what you want. All functions that belong to a class (like your ListMembers function) is a function stored in a variable name.

When you have what you currently have:

WalterFamily.ListMembers

You only print the function object stored at the ListMembers variable. To actually call it, you need to add parenthesis.

WalterFamily.ListMembers()

Answer 2

In Python everything is an object, including functions. So WalterFamily.ListMembers is just a reference to the object. To call the function you need WalterFamily.ListMembers()