BINARY FILE

import pickle

def menu():

    while True:

        print("\n------ MENU ------")

        print("1. Add Book Records")

        print("2. Display All Books")

        print("3. Search Book by ID")

        print("4. Calculate Average Price")

        print("5. Exit")

        ch = int(input("Enter your choice: "))

        if ch == 1:

            add_books()

        elif ch == 2:

            display_books()

        elif ch == 3:

            search_book()

        elif ch == 4:

            average_price()

        elif ch == 5:

            print("Exiting program")

            break

        else:

            print("Invalid choice")

def add_books():

    with open("Book.dat", "ab") as f:

        n = int(input("Enter number of books: "))

        for i in range(n):

            book_id = int(input("Book ID: "))

            title = input("Title: ")

            author = input("Author: ")

            price = float(input("Price: "))

            record = [book_id, title, author, price]

            pickle.dump(record, f)

def display_books():

    try:

        with open("Book.dat", "rb") as f:

            while True:

                record = pickle.load(f)

                print(record)

    except FileNotFoundError:

        print("File not found")

    except EOFError:

        pass

def search_book():

    try:

        bid = int(input("Enter Book ID to search: "))

        found = False

        with open("Book.dat", "rb") as f:

            while True:

                record = pickle.load(f)

                if record[0] == bid:

                    print("Book Found:", record)

                    found = True

                    break

    except FileNotFoundError:

        print("File not found")

    except EOFError:

        if not found:

            print("Book not found")

def average_price():

    try:

        total = count = 0

        with open("Book.dat", "rb") as f:

            while True:

                record = pickle.load(f)

                total += record[3]

                count += 1

    except FileNotFoundError:

        print("File not found")

    except EOFError:

        if count > 0:

            print("Average Price =", total / count)

        else:

            print("No records found")

# Call the menu function

menu()