2. Make a FriendsDB class that contains a list of Friend objects. The FriendsDB should be empty be default, but it will have an add_friend method that takes a Friend object and ado them to a list of friends (which should be a field on the FriendsDB object, called self.friends). Sample usage should look like: >>> friend_db = FriendsDB() >>> friend1 = Friend("sarah", 165) >>> friend1.add_favorite_food("strawberries") >>> friend1.add_favorite_food("apple pie") >>> friend_db.add_friend(friend1) >>> friend_db.friends[0] is friend1 True

2. Make a FriendsDB class that contains a list of Friend objects. The FriendsDB should be empty be default, but it will have an add_friend method that takes a Friend object and ado them to a list of friends (which should be a field on the FriendsDB object, called self.friends). Sample usage should look like: >>> friend_db = FriendsDB() >>> friend1 = Friend("sarah", 165) >>> friend1.add_favorite_food("strawberries") >>> friend1.add_favorite_food("apple pie") >>> friend_db.add_friend(friend1) >>> friend_db.friends[0] is friend1 True

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Lock Objects

The lock object is a feature included in the Advanced Business Application Programming (ABAP) Data Dictionary. They are used to maintain data consistency while inserting and updating data in a database.

Question

2. Make a FriendsDB class that contains a list of Friend objects.
The FriendsDB should be empty be default, but it will have an add_friend method that takes a Friend object and adds
them to a list of friends (which should be a field on the FriendsDB object, called self.friends).
Sample usage should look like:
>>> friend_db
FriendsDB()
>>> friend1
Friend("sarah", 165)
>>> friend1.add_favorite_food("strawberries")
>>> friend1.add_favorite_food("apple pie")
>>> friend_db.add_friend(friend1)
>>> friend_db.friends[0] is friend1
True

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