How to share properties and methods between classes?

Question

Having been here: Python class inherits object, and here What is a metaclass in Python? I'm still unsure of how to get my code working. I'll be honest those explanations were a bit complicated for me. (BTW This is all in Python 3.4).

I'm trying to make Objects for my game in the form of creatures. Example: I want an Object called Dragon, but I want Dragon to inherit the class Entity, and the class Monster.

Here's what I've got:

class Entity:
    id = 0
    xLocation= 0
    yLocation = 0
    name = ''
    description = ''
    def __init__(self, id, xLocation, yLocation, name, description):
        self.xLocation = xLocation
        self.yLocation = yLocation
        self.id = id
        self.name = name
        self.description = description


class Monster:
    life = 0
    pierce = 0
    slash = 0
    blunt = 0
    pierceReduction = 0
    slashReduction = 0
    bluntReduction = 0
    defenseBonus = 0
    score = 0
    def __init__(self, pierceReduction, bluntReduction, slashReduction, price, name, score):
        self.pierceReduction = pierceReduction
        self.bluntReduction = bluntReduction
        self.slashReduction = slashReduction
        self.price = price
        self.name = name
        self.score = score



class Structure:
    pass

Monster = Entity
Dragon = Monster

I don't know how I can give Dragon all of the values of both an entity and a Monster? Obviously setting Dragon directly to monster doesn't work.

*****I've now tried this*****:

class Structure: pass

class Dragon(Entity, Monster): pass

Dragon(10, 10, 10, 1000, 'Dragon', 1000)

The Dragon is saying it doesn't have all the parameters of both classes though?

Is a monster always a type of entity? And a dragon always a type of monster? — 101, Nov 05 '14 at 04:50
If you are going to use inheritance, don't forget about calling the parent class method implementations. (`__init__` in particular) — warvariuc, Nov 05 '14 at 05:25
Dragons are always a monster and entity. Thank you very much viraptor and serkos! (My rep isn't high enough to upvote you both). P.S. warvariuc I don't know what you mean. — Lord Farqwhad, Nov 06 '14 at 00:20

serkos · Answer 1 · 2014-11-05T05:06:50.373

0

You can inherit from Entity class: class Monster(Entity): in declaration. You can find detailed information in documentation

edited Nov 05 '14 at 05:06

answered Nov 05 '14 at 04:59

serkos

306
1
4

score 0 · Answer 2 · answered Nov 05 '14 at 05:16

Python can have classes inheriting from multiple parents. You can simply do:

class Dragon(Monster, Entity):
    # class details

Just make sure that the resolution order between those classes is what you expect. Search for "python mro" for more details about it.

How to share properties and methods between classes?

2 Answers2