[Tutor] Problem

[Mazen Harake]

self doesn't refer to anything?
It is undefined because it is in main and not in a method of an object.

You have to do crit.talk() where crit is an object (which by the way
isn't, you have crit1 and crit2)

On 17 June 2011 09:28, David Merrick <merrickdav at gmail.com> wrote:
> # Critter Caretaker
> # A virtual pet to care for
> class Farm(object):
> #A collection of Critters
>
>     def talk(self,farm):
>         farm.talk()
>
>
>
> class Critter(object):
>
>     """A virtual pet"""
>     def __init__(self, name, hunger = 0, boredom = 0):
>         self.name = name
>         self.hunger = hunger
>         self.boredom = boredom
>
>     # __ denotes private method
>     def __pass_time(self,farm):
>         self.hunger += 1
>         self.boredom += 1
>         self.__str__()
>
>     def __str__(self,farm):
>         print("Hunger is",self.hunger, "Boredom is " ,self.boredom)
>         print("Unhappines is ",self.hunger + self.boredom," and Mood is
> ",self.mood)
>
>
>
>     @property
>     def mood(self,farm):
>         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,farm):
>         print("I'm", self.name, "and I feel", self.mood, "now.\n")
>         self.__pass_time()
>
>
>     def eat(self,farm):
>         food = int(input("Enter how much food you want to feed your critter:
> "))
>         print("Brruppp.  Thank you.")
>         self.hunger -= food
>         # hunger = 0 at iniatition
>         # self.hunger = self.boredom - food
>         if self.hunger < 0:
>             self.hunger = 0
>         self.__pass_time()
>
>
>     def play(self,farm):
>         fun = int(input("Enter how much fun you want your critter to have:
> "))
>         print("Wheee!")
>         self.boredom -= fun
>         # boredom = 0 at iniatition
>         # self.boredom = self.boredom - fun
>         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)
>
>     crit1 = Critter("Sweetie")
>     crit2 = Critter("Dave")
>     farm = [crit1,crit2]
>
>     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":
>             self.talk()
>
>         # feed your critter
>         elif choice == "2":
>             crit.eat()
>
>         # play with your critter
>         elif choice == "3":
>             crit.play()
>
>         # some unknown choice
>         else:
>             print("\nSorry, but", choice, "isn't a valid choice.")
>
>
>
>
>
> main()
> ("\n\nPress the enter key to exit.")
>
> Critter Caretaker
>
>         0 - Quit
>         1 - Listen to your critter
>         2 - Feed your critter
>         3 - Play with your critter
>
> Choice: 1
>
> Traceback (most recent call last):
>   File "D:\David\Python\programs\critter_farm2.py", line 118, in <module>
>     main()
>   File "D:\David\Python\programs\critter_farm2.py", line 100, in main
>     self.talk()
> NameError: global name 'self' is not defined
>>>>
>
> --
> Dave Merrick
>
> merrickdav at gmail.com
>
> Ph   03 3423 121
> Cell 027 3089 169
>
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