Library Management System in Python - Source Code

    
books_in_library = ["In Search of Lost Time by Marcel Proust", "Ulysses by James Joyce",
                    "One Hundred Years of Solitude by Gabriel Garcia Marquez",
                    "War and Peace by Leo Tolstoy", "The Odyssey by Homer"]
logbooks = {}

class Library:
    def __init__(self, library_name, library_books_list):
        self.libraryname = library_name
        self.bookslist = library_books_list

    def books_available(self):
        if books_in_library != []:
            print(f"The book(s) available for lending in {self.libraryname} are:")
        for index, book in enumerate(books_in_library):
            print(index+1,"-", book)
        if books_in_library == []:
            print(f"All the books in {self.libraryname} has benn lended. Plz wait till users return the books.")

    def lend_books(self):
        lender_name = input("Plz enter your kind name: ")
        print(f"Hi, {lender_name}. Welcome to {self.libraryname}.")
        library1.books_available()
        print("---------------------------------------------------------------------")
        lended_book = input("Plz input the name of the book that you want to lend: ")
        print("\n")
        if lended_book in books_in_library:
            print(f"""Congrats! {lended_book} has been issued to you, {lender_name} form {self.libraryname}.
Plz keep it in good shape and return it on time.""")
        elif lended_book in logbooks.keys():
            print(f"""Sorry! {lended_book} book has already been issued by {logbooks[lended_book]}.
You can wait till {logbooks[lended_book]} returns the book
or you can issue some other book that is available in the {self.libraryname}.""")
        else:
            print("""Either the book is not available in our library,
or you have entered the book name case-insenitively.""")
        if lended_book in books_in_library:
            books_in_library.remove(lended_book)
            logbooks.update({lended_book: lender_name})
        print("\n")
        print("Issued Books along with the issuer Names:\n", logbooks)
        print("\n")
        library1.books_available()

    def donate_books(self):
        donated_book = input("Plz input the name of the book that you want to donate: ")
        print(f"You have successfully donated the book '{donated_book}' to {self.libraryname}. Thanks.")
        books_in_library.append(donated_book)

    def return_books(self):
        returned_book = input("Plz input the name of the book that you want to return: ")
        print(f"You have successfully returned {returned_book} to {self.libraryname}. Thanks.")
        books_in_library.append(returned_book)
        library1.books_available()

library1 = Library("Abdur_Library", books_in_library)

while True:
    print("\n")
    print(">> Welcome to Library Management System <<")
    print("Note: Plz choose your option from the following.")
    print("""    1 - What books are available in the library?
    2 - I want to lend a book.
    3 - I want to retun a book back.
    4 - I want to donate a book to the library.
    5 - Exit the library.""")
    option = input("Which option will you choose? ")

    if option == "1":
        print("So you want to know what books are available in this library.")
        library1.books_available()
    elif option == "2":
        if books_in_library == []:
            print(f"Sorry! All the books in our library has benn lended. Plz wait till users return the books.")
        if books_in_library != []:
            print("So you want to lend a book from this library.")
            print("---------------------------------------------------------------------")
            library1.lend_books()
    elif option == "3":
        print("So you want to return a book back to the library.")
        library1.return_books()
    elif option == "4":
        print("So you want to donate a book to our library. That's great!")
        library1.donate_books()
    elif option == "5":
        option = input("""Do you really want to exit? 
              y - Yes
              n - No
              """)
        if option == "y":
            exit()
        else:
            library1.books_available()
    else:
        print("Not a valid option!")