Цепочка методов Python в стиле функционального программирования ⇐ Python

[Гость]

Below is the simple python code, where process_request_non_fp method shows how to handle the problem with IF-ELSE condition ( make-api -> load-db -> notify )
I'm trying to get rid of IF-ELSE and chain in functional way with ERROR being handled in special method ...
Is there any helper from functools , toolz etc to achieve this in simple functional way ?
Thanks

Код: Выделить всё

import random
from pydantic import BaseModel

class APP_ERROR(BaseModel):
error_message: str

class DB_ERROR(APP_ERROR):
pass

class API_ERROR(APP_ERROR):
pass

class NOTIFICATION_ERROR(APP_ERROR):
pass

class Request(BaseModel):
req_id: str

class Response(BaseModel):
response: str

class Ack(BaseModel):
email: str

def get_api_data(request: Request) -> Response | API_ERROR:
if random.choice([True, False]):
print(" Success !! API data successfully retrieved")
return Response(response="Success")
else:
print(" Fail !! API data FAILED")
return API_ERROR(error_message="API Error")

def load_db(response: Response) -> Ack | DB_ERROR:
if random.choice([True, False]):
print(" Success !!  Data loaded to DB")
return Ack(email="test@gmail.com")
else:
print("Fail !! DB Error")
return DB_ERROR(error_message="DB Error")

def notify(ack: Ack) -> bool | NOTIFICATION_ERROR:
if random.choice([True, False]):
print(" Success !! Email notification sent")
return True
else:
print("Fail !! Email notification sent")
return NOTIFICATION_ERROR(error_message="Notification error")

def process_request_non_fp(req: Request) -> bool:
resp = get_api_data(request=req)
if type(resp) is Response:
api_res = load_db(response=resp)
if type(api_res) is Ack:
ack_resp = notify(api_res)
if type(ack_resp) is bool:
return ack_resp
else:
return False
else:
return False
else:
return False

def process_request_fp(req: Request) -> bool:
# (get_api_data)(load_db)(notify)(req).else(lambda x -> API_ERROR : print(Error))
# How to implement this in functional way
pass

process_request_non_fp(Request(req_id="MY_REQUEST"))

Источник: https://stackoverflow.com/questions/781 ... ming-style