Python assignment

"""
We basically want to do a binary tree that has quastions as splitting
"""
yes = ["y", "yes", "Y", "Yes"]
def ask(question):
    ans = input(question+"? ")
    if ans in:
        return True
    else:
        return False

class Node:
    def __init__(self, animal):
        self.left = None
        self.right = None
        self.animal = animal
        self.question = None
    
    def traverse(self):
        if self.question is None:
            print(self.animal)
            was_right = ask("Was I right")
            if was_right:
                print("ez")
            else:
                print("Yikes")
                new_animal = input("What was the animal: ")
                self.question = input("Say question to distinguish: ")
                new_a_true = ask("is this a yes for {}".format(new_animal))
                if new_a_true:
                    self.left = Node(new_animal)
                    self.right = Node(self.animal)
                else:
                    self.right = Node(new_animal)
                    self.left = Node(self.animal)
                self.animal = None
            
            return
        else:
            if ask(self.question):
                return self.left.traverse()
            else:
                return self.right.traverse()

N0 = Node("Dog")
while True:
    print()
    print("Mew round")
    N0.traverse()