Object-oriented programming error

Question

class Ammo(Thing):

    # constructor here
    def __init__(self,name,weapon,quantity):
        self.name = name
        self.weapon = weapon
        self.quantity = quantity

    # definition of weapon_type here
    def weapon_type(self):
        return self.weapon

This is my code and when i try to retrieve the weapon_type as a string Here are my Inputs

bow = Weapon('bow', 10, 20)
arrows = Ammo('arrow', bow, 5)
print(arrows.weapon_type())   ## bow

I don't get bow instead I get <__main__.Weapon object at 0x0211DCB0>

What problem are you having? Also, can you please provide the code for the Weapon class as well? — sshashank124
– sshashank124, Commented Apr 5, 2014 at 5:08
Your sample doesn't show any error, and you don't tell what the problem is. What do you expect to get? What do you get instead? — mdeous
– mdeous, Commented Apr 5, 2014 at 6:10

lvc · Accepted Answer · 2014-04-05 05:15:11Z

5

arrows.weapon_type() will currently return a Weapon rather than a string. print will convert it for you, but I'm guessing it's printing something like this:

<__main__.Weapon object at 0x7ffea6de6208>

to get it to print something more useful, you can control how it converts to string. Print calls the builtin function str on its arguments, which calls the method __str__ - in other words, if you define your Weapon class like this:

class Weapon:
    # other methods
    def __str__(self):
        return self.type + " weapon"

then str(a_weapon), and by extension print(a_weapon) will do something more sensible.

answered Apr 5, 2014 at 5:15

lvc

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1 Comment

user3398505 Over a year ago

Actually I got it simply by returning str(self.weapon)

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