dicts_vs_dataclasses.py

# ugly

def register_user(user_data):
    ...
    save_user_in_db(
      email=user_data['email'],
      first_name=user_data['first_name'],
      ...
    )
  
# beautiful

from dataclasses import dataclass

@dataclass
class UserRegistrationData:
    email: str
    first_name: str
    ...
  
def register_user(user_data: UserRegistrationData) -> None:
    ...
    save_user_in_db(
      email=user_data.email,
      first_name=user_data.first_name,
      ...
    )