So I wanted to test instantiating an object inside another object and the object's constructor requires a reference of the object creating it so I pass it self

orange_you_glad.py

class Tree:
    def __init__(self):
        self.oranges = []

    def grow_orange(self):
        # Creating an object by passing it self
        orange = Orange(self)
        
        self.add_orange(orange)

    def add_orange(self, orange):
        self.oranges.append(orange)

    def __len__(self):
        return len(self.oranges)

class Orange:
    def __init__(self, tree):
        self.tree = tree

        
tree = Tree()

print (str(len(tree)))

tree.grow_orange()

print (str(len(tree)))