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Complete the code to define the main component responsible for sending notifications.
class Notification[1]: def send(self, message, user): pass
The NotificationService class is commonly used to encapsulate notification sending logic.
Complete the code to add a method that queues notifications for asynchronous processing.
class NotificationService: def [1]_notification(self, message, user): # Add notification to queue pass
The method enqueue_notification clearly indicates adding a notification to a queue for later processing.
Fix the error in the code to correctly process notifications from the queue.
def process_notifications(): while not queue.[1](): notification = queue.get() notification.send()
The method is_empty() is the correct way to check if the queue has no items.
Fill both blanks to define a dictionary comprehension that maps user IDs to their notification counts if count is greater than 5.
user_notifications = {user_id: count for user_id, count in notifications.items() if count [1] [2]The condition count > 5 filters users with more than 5 notifications.
Fill all three blanks to create a dictionary comprehension that maps user emails to their last notification timestamp if the timestamp is after 2023-01-01.
recent_notifications = {user[1]: notif[2] for user, notif in notifications.items() if notif[3] '2023-01-01'}The comprehension maps user.email to notif.last_sent if notif.last_sent > '2023-01-01'.