Class design (Book, Member, Librarian, Loan) in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a class for Book with a constructor.

LLD

class Book:
    def __init__(self, title, author):
        self.title = title
        self.author = [1]

Drag options to blanks, or click blank then click option'

Aauthor

Btitle

Cself

Dbook

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning title to self.author by mistake.

The constructor assigns the parameter author to the instance variable self.author.

2fill in blank

medium

Complete the code to add a method that returns the member's name.

LLD

class Member:
    def __init__(self, name):
        self.name = name
    
    def get_name(self):
        return [1]

Drag options to blanks, or click blank then click option'

Aname

Bself.name

Cself

Dmember_name

Attempts:

3 left

💡 Hint

Common Mistakes

Returning just name without self. causes an error.

The method should return the instance variable self.name to access the member's name.

3fill in blank

hard

Fix the error in the Loan class constructor to correctly assign the book and member.

LLD

class Loan:
    def __init__(self, book, member):
        self.book = book
        self.member = [1]

Drag options to blanks, or click blank then click option'

Amember

Bself.member

Cself.book

Dbook

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning self.member to itself causes no change.

The constructor should assign the parameter member to self.member.

4fill in blank

hard

Fill both blanks to complete the method that checks if a book is available (not loaned).

LLD

class Librarian:
    def __init__(self):
        self.loans = []
    
    def is_book_available(self, book):
        for loan in self.loans:
            if loan.[1] == book:
                return [2]
        return True

Drag options to blanks, or click blank then click option'

Abook

BFalse

CTrue

Dmember

Attempts:

3 left

💡 Hint

Common Mistakes

Returning True inside the loop causes wrong availability.

The method checks if any loan's book matches the given book. If yes, it returns False meaning not available.

5fill in blank

hard

Fill all three blanks to create a method that adds a new loan if the book is available.

LLD

class Librarian:
    def __init__(self):
        self.loans = []
    
    def add_loan(self, book, member):
        if self.is_book_available(book):
            new_loan = Loan([1], [2])
            self.loans.[3](new_loan)
            return True
        return False

Drag options to blanks, or click blank then click option'

Abook

Bmember

Cappend

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using remove instead of append causes errors.

The method creates a new Loan with book and member, then appends it to self.loans.