Topic.py

from Subscription import Subscription
from Mail import Mail

class Topic:
    def __init__(self, topic) -> None:
        self.topic = topic
        self.subscriptions = {}

    def subscribe(self, subscription: Subscription):
        if subscription.user.email not in self.subscriptions.keys():
            self.subscriptions[subscription.user.email] = subscription
            return
        self.subscriptions[subscription.user.email].append(subscription)

    def unsubscribe(self, user: User):
        pass

    def setFrequency(self, user: User, frequency):
        self.subscribers[user.email] = frequency

    def pushEmails(self, content, mail: Mail):
        for email in self.subscribers.keys():
            mail.sendMail('News Service', email, content)