[Tutor] Use __str__ method for int values

[Vincent Balmori]

I am trying to use a __str__ method to display the values of attribute mood = self.hunger + self. boredom.
When I try to execute I get this error:

Traceback (most recent call last):
  File "C:/Users/Vincent/Documents/Programming Tutorials/Python Programming for the Absolute Beginner - Project Files/source/chapter08/critter_caretaker_vpb3.py", line 105, in <module>
    main()
  File "C:/Users/Vincent/Documents/Programming Tutorials/Python Programming for the Absolute Beginner - Project Files/source/chapter08/critter_caretaker_vpb3.py", line 99, in main
    print(crit)
TypeError: __str__ returned non-string (type int)


This is the code:


# Critter Caretaker
# A virtual pet to care for

import random

class Critter(object):

    """A virtual pet"""
    def __init__(self, name, hunger = 0, boredom = 0):
        self.name = name
        self.hunger = hunger
        self.boredom = boredom

    def __pass_time(self):
        self.hunger += 1
        self.boredom += 1

    def __str__(self):
        mood = self.boredom + self.hunger
        return mood

    @property
    def mood(self):
        unhappiness = self.hunger + self.boredom
        if unhappiness < 5:
            m = "happy"
        elif 5 <= unhappiness <= 10:
            m = "okay"
        elif 11 <= unhappiness <= 15:
            m = "frustrated"
        else:
            m = "mad"
        return m
    
    def talk(self):
        print("I'm", self.name, "and I feel", self.mood, "now.\n")
        self.__pass_time()
    
    def eat(self, food = 4):
        food = int(input("How much do you want to feed?: "))
        while food > 5:
            food = int(input("That's too much! How much do you want to feed?: "))
        print("Brruppp.  Thank you.")
        self.hunger -= food
        self.boredom += int(food * random.randint(0,3))
        if self.hunger < 0:
            self.hunger = 0
        self.__pass_time()

    def play(self, fun = 4):
        fun = int(input("How long do you want to play?: "))
        while fun > 5:
            fun = int(input("That's too long! How long do you want to play?: "))
        print("Wheee!")
        self.boredom -= fun
        self.hunger += int(fun * random.randint(0,3))
        if self.boredom < 0:
            self.boredom = 0
        self.__pass_time()


def main():
    crit_name = input("What do you want to name your critter?: ")
    crit = Critter(crit_name)

    choice = None  
    while choice != "0":
        print \
        ("""
        Critter Caretaker
    
        0 - Quit
        1 - Listen to your critter
        2 - Feed your critter
        3 - Play with your critter
        """)
    
        choice = input("Choice: ")
        print()

        # exit
        if choice == "0":
            print("Good-bye.")

        # listen to your critter
        elif choice == "1":
            crit.talk()
        
        # feed your critter
        elif choice == "2":
            crit.eat()
         
        # play with your critter
        elif choice == "3":
            crit.play()
              
        # play with your critter
        elif choice == "4":
            print(crit)

        # some unknown choice
        else:
            print("\nSorry, but", choice, "isn't a valid choice.")

main()
("\n\nPress the enter key to exit.") 
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