Code explain Python Class keyword argparse with Namespace

December 10, 2021

I have given a task to solve and understand Python OOP concept.
In following code I did not understand what is the purpose of this following line?

user.args = argparse.Namespace(**data)

And how do I access keyword arguments in User class method displayUser, because object of User class is already created before passing the argument. This is what I thought.

Can anyone explain the following code?

import argparse 


class User(object):
   
    def __init__(self):
        pass

    def displayUser(self):
        pass



if __name__ == "__main__":

    data = {
        "val_1": "John",
        "val_2": "Doe",
    }

    user = User()
    user.args = argparse.Namespace(**data)

>Solution :

I think what you want to do is something like this:

def displayUser(self):
    print(f"Firstname: {self.args.val_1}, last name: {self.args.val_2}")

You can directly access the val_1 and val_2 from the Namespace object that you set to user.args. In python you can set fields of an object despite them not being defined in the constructor, whether this is a nice approach is a totally different question (it is not, imho).