class User:
    def __init__(self, username, email, password,
        firstname, lastname, phone):

        self.username = ""
        self.email = ""
        self.password = ""
        self.firstname = ""
        self.lastname = ""
        self.phone = ""

user=User('x','y','z','f','v','c')
print(vars(user))

{'username': '', 'firstname': '', 'lastname': '', 'phone': '', 'password': '', 'email': ''}

class User:
    def __init__(self, username, email, password,
        firstname, lastname, phone):

    self.username = username
    self.email = email
    self.password = password
    self.firstname = firstname
    self.lastname = lastname
    self.phone = phone

user=User('x','y','z','f','v','c')
print(vars(user))