import smtplib # Concrete low-level class NotificationService: # High-level def alert(self, message): # Direct dependency on SMTP implementation server = smtplib.SMTP("smtp.gmail.com") server.sendmail(...)

class Employee: def __init__(self, name, salary): self.name = name self.salary = salary def calculate_pay(self): return self.salary * 0.8 # Business rule

from abc import ABC, abstractmethod class Bird(ABC): @abstractmethod def move(self): pass

class EmailSender(MessageSender): # Low-level def send(self, message: str) -> None: # SMTP logic here pass

Python 3- Deep Dive -part 4 - Oop- -

import smtplib # Concrete low-level class NotificationService: # High-level def alert(self, message): # Direct dependency on SMTP implementation server = smtplib.SMTP("smtp.gmail.com") server.sendmail(...)

class Employee: def __init__(self, name, salary): self.name = name self.salary = salary def calculate_pay(self): return self.salary * 0.8 # Business rule Python 3- Deep Dive -Part 4 - OOP-

from abc import ABC, abstractmethod class Bird(ABC): @abstractmethod def move(self): pass message: str) -&gt

class EmailSender(MessageSender): # Low-level def send(self, message: str) -> None: # SMTP logic here pass None: # SMTP logic here pass