综合项目：班级图书角借阅系统

# 综合项目：班级图书角借阅系统
class Book:
    """一本书：书名、是否借出、预约队列"""
    def __init__(self, title):
        self.title = title
        self.borrowed = False
        self.queue = []        # 预约队列：先来先得

class Library:
    """图书角：管理所有的书"""
    def __init__(self):
        self.books = []

    def add_book(self, title):
        self.books.append(Book(title))

    def find(self, keyword):
        """按关键字找书（忽略大小写）"""
        result = []
        for b in self.books:
            if keyword.lower() in b.title.lower():
                result.append(b)
        return result

    def borrow(self, title, student):
        for b in self.books:
            if b.title == title:
                if not b.borrowed:
                    b.borrowed = True
                    print(student + " 借到了《" + title + "》")
                else:
                    b.queue.append(student)
                    print("《" + title + "》已借出，" + student + " 排队第 " + str(len(b.queue)) + " 位")
                return
        print("没有找到《" + title + "》")

    def give_back(self, title):
        for b in self.books:
            if b.title == title:
                if b.queue:
                    nxt = b.queue.pop(0)   # 队首的同学优先
                    print("《" + title + "》归还，直接传给排队的 " + nxt)
                else:
                    b.borrowed = False
                    print("《" + title + "》已归还上架")
                return

lib = Library()
lib.add_book("Python 编程入门")
lib.add_book("哈利波特")
lib.add_book("Python 进阶魔法")

found = lib.find("python")
print("搜 python 找到", len(found), "本：")
for b in found:
    print(" -", b.title)

lib.borrow("哈利波特", "小明")
lib.borrow("哈利波特", "小红")
lib.borrow("哈利波特", "小刚")
lib.give_back("哈利波特")