Question

Create a program for a small library information system with requirements:

a. Display options on the screen:

1. Input book record
2. Display book record (Sorted)
3. Update book record
4. Erase book record
5. Save and Exit

Answer 1

Jawaban:

Penjelasan:

import json

def input_book_record():

   title = input("Enter the book title: ")

   author = input("Enter the book author: ")

   isbn = input("Enter the ISBN: ")

   return {'title': title, 'author': author, 'isbn': isbn}

def display_book_record(books):

   books = sorted(books, key=lambda x: x['title'])

   for book in books:

       print(f"Title: {book['title']}\nAuthor: {book['author']}\nISBN: {book['isbn']}\n")

def update_book_record(books):

   isbn = input("Enter the ISBN of the book to update: ")

   for book in books:

       if book['isbn'] == isbn:

           book['title'] = input("Enter the new title: ")

           book['author'] = input("Enter the new author: ")

           print("Book record updated.")

           return

   print("Book not found.")

def erase_book_record(books):

   isbn = input("Enter the ISBN of the book to erase: ")

   for book in books:

       if book['isbn'] == isbn:

           books.remove(book)

           print("Book record erased.")

           return

   print("Book not found.")

def save_and_exit(books):

   with open('books.json', 'w') as f:

       json.dump(books, f)

   print("Data saved and program exited.")

def main():

   books = []

   while True:

       print("1. Input book record\n2. Display book record\n3. Update book record\n4. Erase book record\n5. Save and Exit")

       choice = input("Enter your selection: ")

       if choice == '1':

           books.append(input_book_record())

       elif choice == '2':

           display_book_record(books)

       elif choice == '3':

           update_book_record(books)

       elif choice == '4':

           erase_book_record(books)

       elif choice == '5':

           save_and_exit(books)

           break

       else:

           print("Invalid selection.")

if __name__ == '__main__':

   main()