Python 3.x: Object Not Accepting Definition?

Question

Ok, so I have this class that's supposed to have food, hunger, and some other attributes.

I have just a definition like this:

def setfood():
     choice = input("Choice: ")
     if choice == "1":
           food = 1
           bored = 2
     if choice == "2":
           food = 4
           bored = 8
     return food
     return bored

And then I have this class like this.

class thing(object):
    def __init__(self, name, hunger = 0, boredom = 0):
        self.name = name
        self.hunger = hunger
        self.boredom = boredom

    def eat(self):
       setfood()
       self.hunger -= food
       self.boredom += bored

Well, no matter what I do, I can't get it to work. I kept getting this error about a global variable.

Well, I add in food = 0 and bored = 0 into the main part of the program and it makes no difference because I can't pass the global variables into the definition.

I tried to add the definition into my class and it still made no difference. I also tried to make separate definitions to return each variables...also didn't work. No matter what I do, I can't win.

The only way I can get it to work is if I do this:

food = setfood()

I thought I could maybe change it to this:

food = setfood(food)
food = setfood(bored)

But that doesn't work either...

But, if I do that for both variables, I have to go through the whole thing twice. So what exactly do I do? I'm so lost and frustrated.

you can't return from a method twice. (`return food return bored`) — Adrián, Feb 01 '13 at 02:50
I tried changing it to (return food, bored) and I still get "NameError: global name 'food' is not defined" — Ikiro, Feb 01 '13 at 02:58
`setfood()` works because it's a function that doesn't take any variables. post the traceback and we'll be able to help you more — Jeff, Feb 01 '13 at 03:00
Traceback (most recent call last): File "", line 26, in main() File "", line 24, in main creat.eat() File "", line 9, in eat self.hunger -= food NameError: global name 'food' is not defined — Ikiro, Feb 01 '13 at 03:09
I ended up just adding it to the attribute and it worked...but I'm still curious to know if there's some way to use a definition. — Ikiro, Feb 01 '13 at 03:10

score 1 · Accepted Answer · answered Feb 01 '13 at 03:09

"NameError: global name 'food' is not defined"

food in your function is only defined when you enter one of the if blocks. Are you entering input other than 1 or 2? If os food won't be defined to anything. You could have a default value for food like:

food = 0 # food stays at 0 for invalid choices
choice = input("Choice: ")
if choice == "1":
     food = 1
     bored = 2
if choice == "2":
     food = 4
     bored = 8
return food

Also to return two variables your return statements need to return a tuple, ie

 return (food, bored)

then the caller can do

 (food, bored) = setfood()

and you'll be able to return two values at once as you intend

Ooh! Thanks. Learned something today – Frantz Romain Feb 01 '13 at 03:43 — Frantz Romain, Feb 01 '13 at 03:43

score 0 · Answer 2 · edited May 23 '17 at 12:27

0

def setfood():

Is a set method. It should not have to return anything. You should define other methods like getfood() or getboredStatus() to return food status or bored status. See here for more info

edited May 23 '17 at 12:27

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answered Feb 01 '13 at 03:06

Frantz Romain

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Python 3.x: Object Not Accepting Definition?

2 Answers2