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class MetaRace(type): | |
def __new__(mcs, name, bases, dct): | |
dct['genre'] = 'M' # ecrasé après | |
dct['espece'] = 'YAGARA' # pas ecrasé | |
return super().__new__(mcs, name, bases, dct) | |
class Parent: | |
nom = "daron" | |
say = f"je suis {nom}" | |
nom_de_famille = "dugland" | |
def inst_meth(self): | |
return self.nom + " est mon nom" | |
class MetaSoeur(MetaRace): # hérité pas de type mais d'une autre metaclasse. Faut que ce soit la mm pr toutes | |
def __new__(mcs, name, bases, dct): | |
print(dct) # le dico des attributs de la classe enfant.. | |
bases = (Parent,) | |
dct['say'] = f"je suis {dct['nom']}" | |
inst = super().__new__(mcs, name, bases, dct) | |
# on peut modifier ensuite ce que le __new__ hérité de MetaRace | |
inst.genre = 'multi' | |
# on surcharge la méthode du parent | |
inst.inst_meth = lambda self: super(inst, self).inst_meth() + " a moi" | |
return inst | |
# autre syntaxe, pour le meme effet | |
# def __new__(mcs, name, bases, dct): | |
# class EnfantHerintant(Parent, metaclass=MetaRace): # ici on ignoré le super ds __new__, dc on peut appeler l'autre metaclasse | |
# nom = dct['nom'] # par contre faut passer manuellement les attrs de l'enfant | |
# say = f"je suis {nom}" | |
# | |
# genre = "multi sans effet" # écrasé par Metarace | |
# | |
# def inst_meth(self): | |
# return super().inst_meth() + " a moi" | |
# | |
# EnfantHerintant.genre = "multi" | |
# return EnfantHerintant | |
class Enfant(metaclass=MetaSoeur): | |
nom = "chiard" | |
print(Enfant.say) | |
print(Enfant.nom) | |
print(Enfant.nom_de_famille) | |
print(Enfant.genre) | |
print(Enfant.espece) | |
print(Enfant().inst_meth()) |
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