辽宁
以下是一个完整的图书借阅管理系统的Python实现，包含核心功能（图书管理、借阅/归还、查询等），无需任何外部库或网址依赖，直接运行即可使用：
完整代码
python
import datetime
class Book:
def __init__(self, book_id, title, author, total_copies=1):
self.book_id = book_id #图书ID
self.title = title #书名
self.author = author #作者
self.total_copies = total_copies #总副本数
self.available_copies = total_copies #可借副本数
self.borrow_records = [] #借阅记录（记录用户ID和借阅日期）
def __str__(self):
return f"ID: {self.book_id} |书名: {self.title} |作者: {self.author} |可借副本: {self.available_copies}/{self.total_copies}"
class User:
def __init__(self, user_id, name):
self.user_id = user_id #用户ID
self.name = name #用户名
self.borrowed_books = {} #借阅的图书{book_id:归还截止日期}
def __str__(self):
return f"用户ID: {self.user_id} |姓名: {self.name} |当前借阅: {len(self.borrowed_books)}本"
class Library:
def __init__(self):
self.books = {} #所有图书{book_id: Book对象}
self.users = {} #所有用户{user_id: User对象}
self.borrow_period = 30 #默认借阅期限（天）
# ==========图书管理==========
def add_book(self, book_id, title, author, copies=1):
if book_id in self.books:
print("❌ 图书ID已存在！")
else:
self.books[book_id] = Book(book_id, title, author, copies)
print(f"✅ 成功添加图书: {title} (共{copies}本)")
def remove_book(self, book_id):
if book_id not in self.books:
print("❌ 图书不存在！")
elif self.books[book_id].borrow_records:
print("❌ 图书有未归还记录，无法删除！")
else:
del self.books[book_id]
print(f"✅ 已删除图书ID: {book_id}")
# ==========用户管理==========
def register_user(self, user_id, name):
if user_id in self.users:
print("❌ 用户ID已存在！")
else:
self.users[user_id] = User(user_id, name)
print(f"✅ 成功注册用户: {name}")
# ==========借阅功能==========
def borrow_book(self, user_id, book_id):
if user_id not in self.users:
print("❌ 用户不存在！")
elif book_id not in self.books:
print("❌ 图书不存在！")
elif self.books[book_id].available_copies <= 0:
print("❌ 图书已全部借出！")
else:
user = self.users[user_id]
book = self.books[book_id]
#记录借阅
due_date = datetime.date.today() + datetime.timedelta(days=self.borrow_period)
user.borrowed_books[book_id] = due_date
book.available_copies -= 1
book.borrow_records.append((user_id, datetime.date.today()))
print(f"✅ 用户{user.name}成功借阅《{book.title}》，请于{due_date}前归还。")
def return_book(self, user_id, book_id):
if user_id not in self.users:
print("❌ 用户不存在！")
elif book_id not in self.books:
print("❌ 图书不存在！")
elif book_id not in self.users[user_id].borrowed_books:
print("❌ 用户未借阅此书！")
else:
user = self.users[user_id]
book = self.books[book_id]
#归还图书
del user.borrowed_books[book_id]
book.available_copies += 1
#检查是否逾期
due_date = user.borrowed_books[book_id]
today = datetime.date.today()
if today > due_date:
days_overdue = (today - due_date).days
print(f"⚠️图书已逾期{days_overdue}天，请尽快缴纳罚款！")
else:
print(f"✅ 用户{user.name}已归还《{book.title}》。")
# ==========查询功能==========
def search_books(self, keyword):
results = []
for book in self.books.values():
if (keyword.lower() in book.title.lower() or
keyword.lower() in book.author.lower() or
keyword.lower() in book.book_id.lower()):
results.append(book)
if results:
print("\n�� 搜索结果:")
for book in results:
print(book)
else:
print("❌ 未找到匹配的图书！")
def list_all_books(self):
if not self.books:
print("�� 图书馆暂无图书！")
else:
print("\n�� 所有图书:")
for book in self.books.values():
print(book)
def list_user_borrowed(self, user_id):
if user_id not in self.users:
print("❌ 用户不存在！")
else:
user = self.users[user_id]
print(f"\n��{user.name}的借阅记录:")
if not user.borrowed_books:
print("无借阅记录")
else:
for book_id, due_date in user.borrowed_books.items():
book = self.books.get(book_id, None)
title = book.title if book else "未知图书"
print(f"-《{title}》(截止日期: {due_date})")
# ==========主菜单==========
def main():
library = Library()
#预置测试数据
library.add_book("B001", "三体", "刘慈欣", 2)
library.add_book("B002", "平凡的世界", "路遥", 1)
library.register_user("U001", "张三")
library.register_user("U002", "李四")
while True:
print("\n===图书借阅管理系统===")
print("1.图书管理")
print("2.用户管理")
print("3.借阅/归还")
print("4.查询")
print("5.退出系统")
choice = input("请选择功能(1-5): ").strip()
#图书管理
if choice == "1":
print("\n---图书管理---")
print("1.添加图书")
print("2.删除图书")
print("3.查看所有图书")
sub_choice = input("请选择操作(1-3): ").strip()
if sub_choice == "1":
book_id = input("输入图书ID: ").strip()
title = input("输入书名: ").strip()
author = input("输入作者: ").strip()
copies = int(input("输入副本数量: ").strip() or 1)
library.add_book(book_id, title, author, copies)
elif sub_choice == "2":
book_id = input("输入要删除的图书ID: ").strip()
library.remove_book(book_id)
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