使用派森python类打造图书管理系统~

上代码~

from datetime import datetime
from time import sleep

class Book:
    def __init__(self, Name, Price, State):
        self.State = State
        self.Price = Price
        self.Name = Name

    def __str__(self):
        State = "已借出"
        if self.State == 1:
            State = "未借出"
        return "名称：《%s》，单价：%.2f元，状态：%s" % (self.Name, self.Price, State)


class BookManager:
    books = []
    password = "*#041#*"

    def init(self):
        self.books.append(Book("茶花女", 32.6, 0))
        self.books.append(Book("傲慢与偏见", 41.8, 1))
        self.books.append(Book("罗密欧与朱丽叶", 29.5, 1))

    def Menu(self):
        self.init()
        print("#########################")
        print("## " + str(datetime.now())[:-7] + " ##")
        print("#########################\n")
        print("书籍出租管理系统 v1.0 内测版\n菜单：")
        print("1.显示书籍\n2.增加书籍\n3.借出书籍\n4.归还书籍\n5.统计书籍\n-1.退出系统")
        while True:
            try:
                menu_item = int(input("*************请输入菜单编号:").strip())
                if menu_item == 1:
                    self.show_all_books()
                elif menu_item == 2:
                    self.add_books()
                elif menu_item == 3:
                    self.lend_books()
                elif menu_item == 4:
                    self.return_books()
                elif menu_item == 5:
                    self.count_books()
                elif menu_item == -1:
                    print("谢谢使用！")
                    sleep(2)
                    break
                else:
                    print('请输入正确的选项！')
            except ValueError:
                print('请输入正确的选项！')

    def show_all_books(self):
        for book in self.books:
            print(str(book))

    def add_books(self):
        in_password = input("请输入图书管理员验证码：").strip()
        if in_password == self.password:
            book_name = input("请输入添加的书籍名称：")
            ret = self.check_books(book_name)
            if ret is not None:
                print("书籍已经存在！")
            else:
                book_price = float(input("请输入书籍单价:"))
                new_book = Book(book_name, book_price, 1)
                self.books.append(new_book)
                print("书籍添加成功！")
        else:
            print("验证码错误！")

    def lend_books(self):
        book_name = input("请输入借出书籍的名称：")
        ret = self.check_books(book_name)
        if ret is not None:
            if ret.State == 0:
                print("您要借的书籍已经借出去了！")
            else:
                ret.State = 0
                print("借出书籍成功！")
        else:
            print("您要借的书籍不存在！")

    def return_books(self):
        book_name = input("请输入归还书籍的名称：")
        ret = self.check_books(book_name)
        if ret is None:
            print("您要归还的书籍不存在！")
        else:
            if ret.State == 1:
                print("您要归还的书籍未借出！")
            else:
                lend_days = int(input("请输入本次借书的天数:"))
                fee = round(ret.Price * lend_days * 0.1, 2)
                print("借出%d天，应付租书费%.2f元。" % (lend_days, fee))
                while True:
                    pay = float(input("请输入支付金额(元)："))
                    if pay < fee:
                        print("您所输入的金额不够！")
                    else:
                        break
                if pay >= fee:
                    print("找零：%.2f元。" % (pay - fee))
                ret.State = 1
                print("还书成功！")

    def count_books(self):
        lend_count = 0
        not_lend_count = 0
        for item in self.books:
            if item.State == 0:
                lend_count += 1
            else:
                not_lend_count += 1
        print("已借出书籍：%d册" % lend_count)
        print("未借出书籍：%d册" % not_lend_count)
        print("共有书籍：%d册" % len(self.books))

    def check_books(self, Name):
        for book in self.books:
            if book.Name == Name:
                return book
        else:
            return None


if __name__ == "__main__":
    manager = BookManager()
    manager.Menu()