将字符串转换为 class 变量名

Question

My problem is the following: I've created, in Python, a class let's imagine it is a character with stats, level etc...

I've also created a dictionary in which are lists all the character name and stats, the key of the dictionary being the name of the character.

I want to create a function that takes in argument the dictionary and that create the characters as an instance of my class. The problem is that i don't know how to give the character name to my variable, i only have the string corresponding to his name by collecting the key.

Example:

class Character():
       def __init__(self,Name,Age):
                self.Nom=Name
                self.Age=Age


List_Character= {"Roger" : 36, "Kimberley" : 98} 

How can I create a function that takes List_Character and return two instance of Character which variable name are Roger and Kimberley?

Answer 1

Try the following:

class Character():
       def __init__(self,Name,Age):
                self.Nom=Name
                self.Age=Age
                
       def __repr__(self):
           return f"{self.__class__.__name__}(Name={self.Nom}, Age={self.Age})"


List_Character= {"Roger" : 36, "Kimberley" : 98}

def create_instance(cls, params: dict):
    ret = ()
    for k,v in params.items():
        globals()[k] = cls(k, v)
        ret = ret + (globals()[k],)
    return ret

>>> create_instance(Character, List_Character)
(Character(Name=Roger, Age=36), Character(Name=Kimberley, Age=98))

>>> Roger
Character(Name=Roger, Age=36)

>>> Kimberley
Character(Name=Kimberley, Age=98)

While the __repr__ method is not strictly necessary, the code would work all the same without it, it just gives better representations.

The function can be shortened/optimized using itertools.starmap :

from itertools import starmap
def create_instance(cls, params: dict):
    keys, vals = params.keys(), tuple(starmap(cls, params.items()))
    globals().update(dict(zip(keys, vals)))
    return vals

Answer 2

All you need to do is to iterate over your dict and create new characters from them, append them to a list and return this list:

class Character():
       def __init__(self,Name,Age):
                self.Nom=Name
                self.Age=Age


List_Character= {"Roger" : 36, "Kimberley" : 98}

def create_characters(char_dict):
    return_list = []
    for k,v in char_dict.items():
        return_list.append(Character(k,v))
    return return_list

print(create_characters(List_Character)[0].Nom, create_characters(List_Character)[0].Age)

returns:

Roger 36

I assumed by "return two instances" you meant for example a list with all instances in there, right? Since I guess you don't only want to have it for 2 instances, but rather as many as there are in the dict you use as input.

#Edit: If you want to access the characters by their name you can use a dict for that:

def create_characters(char_dict):
    return_dict = dict()
    for k,v in char_dict.items():
        return_dict[k] = Character(k,v)
    return return_dict

dict_of_chars = create_characters(List_Character)
print(dict_of_chars["Roger"].Age)