problem with Classes and dictionaries in python

Question

I'm am trying to convert my old game engine into a newer version that uses classes instead of just dictionaries.

My goal is to add similar key values together from two different classes in order to modify stats of the player.

class player:
    def __init__(self, name, level, xp, nextlvlxp, stats, inventory):
        self.name = ''
        self.level = 1
        self.xp = 0
        self.nextlvlxp = 25
        self.stats = {
            'str': [],
            'dex': [],
            'con': [],
            'int': [],
            'wis': [],
            'cha': [],
            'modstr': [],
            'moddex': [],
            'modcon': [],
            'modint': [],
            'modwis': [],
            'modcha': []
        }
        self.combat_stats = {
            'totalhp': [],
            'currenthp':[],
            'totalmp': [],
            'currentmp': [],
            'baseatk': [],
            'attack': [],
            'speed': [],
            'perception':[]

        }
        self.noncombat_stats = {
            'evasion': [],
        }
        self.inventory = {}


class Item():
    def __init__(self, name, description, stats, value):
        self.name = name
        self.description = description
        self.stats = {}
        self.value = value
class Weapon(Item):
    def __init__(self, name, description, stats, value):
        self.stats = stats
        super().__init__(name, description, value)

    def __str__(self):
        return "{}\n=====\n{}\nValue: {}\nStats: {}".format(self.name, self.description, self.value, self.stats)

class Sword(Weapon):
    def __init__(self):
        super().__init__(name="Sword",
                         description="A common shortsword",
                         stats = {
                             'str': 2,
                             'dex': 1
                         },
                         value = 10)

Example:items 'sword' 'str' + player 'str' = player 'modstr'

I want to be able to add those together and also the next values for dex, I want to do this in a way that is nonrepetitive. I'm not really sure where to begin, I just barely learned how classes to write Classes today. Is there any way to go through the dictionary and add values together that have the same key?

Answer 1

That's basically what you would do, however I'm not sure in your case, since your default attributes are empty lists.

a = {1: 2, 3: 4, 5: 6}
b = {1: 8, 3: 2, 7: 8}

for key in a:
    if key in b:
        a[key] += b[key]

for example:

class Pool:
    def __init__(self, value):
        self.value = value
        self.max_value = value

class Stats:
    def __init__(self, strength=0, dexterity=0, constitution=0, intelligence=0, wisdom=0, charisma=0):
        self.strength = strength
        self.dexterity = dexterity
        self.constitution = constitution
        self.intelligence = intelligence
        self.wisdom = wisdom
        self.charisma = charisma

    def __add__(self, stats):
        return Stats(
            self.strength + stats.strength,
            self.dexterity + stats.dexterity,
            self.constitution + stats.constitution,
            self.intelligence + stats.intelligence,
            self.wisdom + stats.wisdom,
            self.charisma + stats.charisma
        )

    def copy(self):
        return Stats(
            self.strength,
            self.dexterity,
            self.constitution,
            self.intelligence,
            self.wisdom,
            self.charisma
        )

    def __repr__(self):
        return str(vars(self))

class Equipment:
    def __init__(self):
        self.weapon = Weapon('None', 'None', 0, Stats())
        self.chest = Weapon('None', 'None', 0, Stats())
        self.hands = Weapon('None', 'None', 0, Stats())
        self.head = Weapon('None', 'None', 0, Stats())
        self.legs = Weapon('None', 'None', 0, Stats())

    def __repr__(self):
        return str(vars(self))

class Player:
    def __init__(self, name, next_xp, stats, inventory):
        self.xp = 0
        self.name = name
        self.stats = stats
        self.next_xp = next_xp
        self.inventory = inventory
        self.equipment = Equipment()

    def get_stats(self):
        stats = self.stats.copy()
        elist = vars(self.equipment)
        for v in elist:
            stats += elist[v].stats

        return stats

class Item:
    def __init__(self, name, description, value):
        self.name = name
        self.description = description
        self.value = value

class Weapon(Item):
    def __init__(self, name, description, value, stats):
        Item.__init__(self, name, description, value)
        self.stats = stats

    def __repr__(self):
        return str(vars(self))

def main():
    weapons = {}
    weapons['sword'] = Weapon('sword', 'common sword', 10, Stats(2, 1))
    weapons['intelligence sword'] = Weapon('intelligence sword', 'sword of intelligence', 10, Stats(2, 1, intelligence=1))

    player = Player('Me', 25, Stats(5, 4, 6, 3, 3, 4), {})
    print(player.get_stats())
    player.equipment.weapon = weapons['sword']
    print(player.get_stats())
    player.equipment.weapon = weapons['intelligence sword']
    print(player.get_stats())

main()