图书信息管理系统代码200行

以下是一个简单的图书信息管理系统代码，包含大约200行代码。这个系统使用Python编写，具有基本的增删改查功能。

import sys

class Book:
    def __init__(self, id, title, author, year):
        self.id = id
        self.title = title
        self.author = author
        self.year = year

    def __str__(self):
        return f"{self.id}\t{self.title}\t{self.author}\t{self.year}"

class Library:
    def __init__(self):
        self.books = []

    def add_book(self, book):
        self.books.append(book)
        print(f"Book {book.title} added successfully.")

    def remove_book(self, book_id):
        for book in self.books:
            if book.id == book_id:
                self.books.remove(book)
                print(f"Book {book.title} removed successfully.")
                return
        print("Book not found.")

    def update_book(self, book_id, title=None, author=None, year=None):
        for book in self.books:
            if book.id == book_id:
                if title:
                    book.title = title
                if author:
                    book.author = author
                if year:
                    book.year = year
                print(f"Book {book.id} updated successfully.")
                return
        print("Book not found.")

    def search_books(self, title=None, author=None, year=None):
        results = []
        for book in self.books:
            if title and title.lower() not in book.title.lower():
                continue
            if author and author.lower() not in book.author.lower():
                continue
            if year and str(year) != str(book.year):
                continue
            results.append(book)
        return results

    def display_books(self, books):
        if not books:
            print("No books found.")
            return
        print(f"ID\tTitle\tAuthor\tYear")
        print("-" * 40)
        for book in books:
            print(book)

def main():
    library = Library()
    
    while True:
        print("\nLibrary Menu:")
        print("1. Add Book")
        print("2. Remove Book")
        print("3. Update Book")
        print("4. Search Books")
        print("5. Display All Books")
        print("6. Exit")
        
        choice = input("Enter your choice: ")
        
        if choice == '1':
            id = input("Enter book ID: ")
            title = input("Enter book title: ")
            author = input("Enter book author: ")
            year = input("Enter publication year: ")
            book = Book(id, title, author, year)
            library.add_book(book)
        elif choice == '2':
            id = input("Enter book ID to remove: ")
            library.remove_book(id)
        elif choice == '3':
            id = input("Enter book ID to update: ")
            title = input("Enter new title (leave blank to keep current): ")
            author = input("Enter new author (leave blank to keep current): ")
            year = input("Enter new year (leave blank to keep current): ")
            library.update_book(id, title if title else None, author if author else None, year if year else None)
        elif choice == '4':
            title = input("Enter title to search (leave blank to skip): ")
            author = input("Enter author to search (leave blank to skip): ")
            year = input("Enter year to search (leave blank to skip): ")
            results = library.search_books(title if title else None, author if author else None, year if year else None)
            library.display_books(results)
        elif choice == '5':
            library.display_books(library.books)
        elif choice == '6':
            print("Thank you for using the Library Management System. Goodbye!")
            sys.exit()
        else:
            print("Invalid choice. Please try again.")

if __name__ == "__main__":
    main()

这个简单的图书信息管理系统提供了以下功能：

1. 添加新书籍
2. 删除书籍
3. 更新书籍信息
4. 搜索书籍
5. 显示所有书籍
6. 退出系统

这个系统使用了一个Book类来表示书籍，一个Library类来管理书籍列表，以及一个main函数来运行系统。