main.py

class Library:

    def __init__(self, listOfBooks):
        self.books = listOfBooks

    def displayAvailableBooks(self):
        print("Books available in the library are: ")
        for book in self.books:
            print("*" + book)

    def borrowBook(self, bookName):
        if bookName in self.books:
            print(f"You have been issue {bookName}. Please keep it safe and return it within 30 days.")
            self.books.remove(bookName)
            return True
        else:
            print("Sorry, This book is either not available or has already been issued to someone else. Please wait until the book is available again.")
            return False

    def returnBook(self, bookName):
        if bookName in self.books:
            print(f"{bookName} is already present in the library and was not issued to anyone recently")
        else:
            self.books.append(bookName)
            print("Thanks for returning this book! Hope you enjoyed reading it. Have a great day ahead!")

class Student:
    def requestBook(self):
        self.book = input("Enter the name of the book you want to borrow: ")
        return self.book

    def returnBook(self):
        self.book = input("Enter the name of the book you want to return: ")
        return self.book

if __name__ == "__main__":
    centralLibrary = Library(["Algorithms", "Django", "Machine Learning", "Clrs"])
    student = Student()
    # centralLibrary.displayAvailableBooks()
    while(True):
        welcomeMsg = '''
        ===== Welcome To Central Library =====
        Please choose an option:
        1. List all the books
        2. Request a book
        3. Add/Return a book
        4. Exit the Library
        '''
        print(welcomeMsg)
        a = int(input("Enter a choice: "))
        if a == 1:
            centralLibrary.displayAvailableBooks()
        elif a == 2:
            centralLibrary.borrowBook(student.requestBook())
        elif a == 3:
            centralLibrary.returnBook(student.returnBook())
        elif a == 4:
            print("Thanks for choosing Central Library. Have a great day ahead!")
            exit()
        else:
            print("Invalid Choice!")