How to cast a variable to custom Class in python

Question

I have this variable that I want to cast to custom class

obj = {'model': 'User'}

User is a Aqlalchemy model name.

I want something like this:

user = User()

and of course this wouldn't work:

use = obj['model']()

thanks in advance

Yes, actually, I'm getting a json from other service, it would be result of service which is String so can not be object type User — Masoud Motallebipour
– Masoud Motallebipour, Commented Apr 8, 2020 at 11:54

S4eed3sm · Accepted Answer · 2022-06-20 17:56:13Z

1

You can store your class in a dictionary and then by your json input you can convert json to a dictionary from model to class:

import json

class User:
    def __str__(self) -> str:
        return "User Class"

class Admin:
    def __str__(self) -> str:
        return "Admin Class"

models= {"User": User, "Admin": Admin}

jsonStr = '{"model1":"User","model2":"Admin"}'
obj = json.loads(jsonStr)

convertedObj = {k:models[v] for k,v in obj.items()}

print(convertedObj["model1"]())
print(convertedObj["model2"]())

The output will be:

User Class
Admin Class

answered Jun 20, 2022 at 17:56

S4eed3sm

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