用python写一个图书馆管理系统

A：

非常感谢你提出这个问题。下面我将提供一个简单的Python程序作为图书馆管理系统的实现，希望能对你有所帮助。

首先，我们需要一些必要的库。

import json
import os

然后，我们需要定义一些全局变量。

book_file_path = "books.json"
user_file_path = "users.json"

books = []
users = []

接下来，我们定义一些函数。

1. `load_books`：从`books.json`文件中读取图书信息并存储到`books`列表中。

def load_books():
    global books

    if os.path.exists(book_file_path):
        with open(book_file_path) as file:
            books = json.load(file)

    else:
        save_books()


def save_books():
    with open(book_file_path, 'w') as file:
        json.dump(books, file)

2. `load_users`：从`users.json`文件中读取用户信息并存储到`users`列表中。

def load_users():
    global users

    if os.path.exists(user_file_path):
        with open(user_file_path) as file:
            users = json.load(file)

    else:
        save_users()


def save_users():
    with open(user_file_path, 'w') as file:
        json.dump(users, file)

3. `list_books`：列出所有可用的图书。

def list_books():
    for book in books:
        if book['status'] == 'available':
            print(f"ID: {book['id']}, Title: {book['title']}, Author: {book['author']}, Publisher: {book['publisher']}")

4. `get_book`：根据图书ID获取图书信息。

def get_book(book_id):
    for book in books:
        if book['id'] == book_id:
            return book

    return None

5. `borrow_book`：借阅图书。

def borrow_book(book_id, user_id):
    book = get_book(book_id)

    if book is not None and book['status'] == 'available':
        book['status'] = 'borrowed'
        book['borrower_id'] = user_id
        save_books()
        print("Book borrowed successfully.")

    else:
        print("Book not found or already borrowed.")

6. `return_book`：归还图书。

def return_book(book_id):
    book = get_book(book_id)

    if book is not None and book['status'] == 'borrowed':
        book['status'] = 'available'
        book.pop('borrower_id', None)
        save_books()
        print("Book returned successfully.")

    else:
        print("Book not found or already returned.")

7. `list_users`：列出所有注册的用户。

def list_users():
    for user in users:
        print(f"ID: {user['id']}, Name: {user['name']}")

8. `get_user`：根据用户ID获取用户信息。

def get_user(user_id):
    for user in users:
        if user['id'] == user_id:
            return user

    return None

9. `add_user`：添加新用户。

def add_user(name):
    user_id = len(users) + 1
    user = {'id': user_id, 'name': name}
    users.append(user)
    save_users()
    print(f"User {name} added successfully. User ID is {user_id}.")

有了这些函数，我们就可以实现一个基本的控制台图书馆管理系统。

def main():
    load_books()
    load_users()

    while True:
        print("\nLibrary Management System\n")
        print("1. List Available Books")
        print("2. Borrow a Book")
        print("3. Return a Book")
        print("4. List All Users")
        print("5. Add a New User")
        print("6. Exit")

        choice = input("Enter your choice: ")

        if choice == '1':
            list_books()

        elif choice == '2':
            book_id = input("Enter Book ID: ")
            user_id = input("Enter User ID: ")
            borrow_book(int(book_id), int(user_id))

        elif choice == '3':
            book_id = input("Enter Book ID: ")
            return_book(int(book_id))

        elif choice == '4':
            list_users()

        elif choice == '5':
            name = input("Enter User Name: ")
            add_user(name)

        elif choice == '6':
            break

        else:
            print("Invalid choice.")

这个程序简单地提供了一些基本功能，并且只是一个演示，实际使用中可能需要更多的功能和错误处理，但至少它可以作为一个起点。