class BookManagers: def __init__(self): self.book_list = [] # 建立一个存储数据用的列表 self.apply = [] # 图书建购表 def show_borrowed_books(self): print('借阅图书信息') for book in self.book_list: if book.status == '借出': print(f'书籍名：{book.name}, 作者：{book.author}, 编码：{book.index}') def run(self, number): # 程序入口函数 if number == 1: while True: self.show_menu() # 显示功能菜单 menun_num = int(input("请输入您需要的功能序号：")) # 用户输入功能序号

这段代码是一个简单的图书管理系统的类，其中包括了两个列表，一个是存储图书信息的book_list，另一个是存储图书建购信息的apply。show_borrowed_books()函数用于展示当前被借出的图书信息，而run()函数是程序的入口函数，通过输入不同的功能序号来实现不同的功能。请问还有什么需要我解释的吗？

相关问题

class BookManagers: def __init__(self): self.book_list = [] # 建立一个存储数据用的列表 self.apply = [] # 图书建购表 def show_borrowed_books(self): print('借阅图书信息') for book in self.book_list: if book.status == '借出': print(f'书籍名：{book.name}, 作者：{book.author}, 编码：{book.index}')在此基础上增加借书与还书代码

你可以使用如下的代码来增加借书与还书的功能：

class BookManagers:
    def __init__(self):
        self.book_list = []  # 建立一个存储数据用的列表
        self.apply = []  # 图书建购表

    def show_borrowed_books(self):
        print('借阅图书信息')
        for book in self.book_list:
            if book.status == '借出':
                print(f'书籍名：{book.name}, 作者：{book.author}, 编码：{book.index}')

    def borrow_book(self, index):
        book = self.find_book(index)
        if book is not None:
            if book.status == '借出':
                print('此书已被借出')
            else:
                book.status = '借出'
                print('借书成功')
        else:
            print('未找到该书')

    def return_book(self, index):
        book = self.find_book(index)
        if book is not None:
            if book.status == '借出':
                book.status = '在库'
                print('还书成功')
            else:
                print('此书未被借出')
        else:
            print('未找到该书')

    def find_book(self, index):
        for book in self.book_list:
            if book.index == index:
                return book
        return None

其中，`borrow_book`和`return_book`方法分别用于借书和还书，`find_book`方法用于查找书籍。你可以根据需要调用这些方法来实现借书和还书的功能。

帮我把一下代码设置一个合理请求头，并加入一个延时import requests import os from bs4 import BeautifulSoup class NovelDownloader: def __init__(self, root_url): self.root_url = root_url self.book_list = [] self.chapter_list = [] def get_url(self, url): while True: try: res = requests.get(url) if res.status_code == 200: print("页面获取成功！") return res.text else: print("页面返回异常！", res.status_code) except: print("页面获取错误！") def get_book_list(self): res = self.get_url(self.root_url) html = BeautifulSoup(res, "html.parser") a_list = html.find_all("a", {"class": "name"}) for a in a_list: self.book_list.append(a["href"]) self.book_list = [self.root_url + i for i in self.book_list] self.book_list.remove('http://www.biquge5200.cc/') def get_chapter_list(self, url): res = self.get_url(url) html = BeautifulSoup(res, "html.parser") a_list = html.find_all("a", {"class": "chapter"}) for a in a_list: self.chapter_list.append((a["href"], a.text.replace("\n", ""))) def get_content(self, chapter): url = self.root_url + chapter[0] print(url) book_name = chapter[0].split("/")[1] print(book_name) if not os.path.exists(book_name): os.mkdir(book_name) res = self.get_url(url) html = BeautifulSoup(res, "html.parser") content = html.find("div", {"id": "content"}).text print(content) path = os.path.join(book_name, chapter[1]) with open(path, "w", encoding="utf8") as f: f.write(content) def main(self): self.get_book_list() for book in self.book_list: self.get_chapter_list(book) for chapter in self.chapter_list: self.get_content(chapter) if __name__ == '__main__': root_url = "http://www.biquge5200.cc/" nd = NovelDownloader(root_url) nd.main()

好的，我可以帮你添加一个合理的请求头和延时。在 `get_url` 方法中，你可以添加一个请求头字典，来模拟浏览器发送请求。同时，在每次请求后添加一个时间延时，避免频繁请求被网站屏蔽。

修改后的代码如下所示：

import requests
import os
import time
from bs4 import BeautifulSoup

class NovelDownloader:
    def __init__(self, root_url):
        self.root_url = root_url
        self.book_list = []
        self.chapter_list = []
        self.headers = {
            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3"
        } # 添加请求头

    def get_url(self, url):
        while True:
            try:
                res = requests.get(url, headers=self.headers)
                if res.status_code == 200:
                    print("页面获取成功！")
                    return res.text
                else:
                    print("页面返回异常！", res.status_code)
            except:
                print("页面获取错误！")
            time.sleep(1) # 添加延时

    def get_book_list(self):
        res = self.get_url(self.root_url)
        html = BeautifulSoup(res, "html.parser")
        a_list = html.find_all("a", {"class": "name"})
        for a in a_list:
            self.book_list.append(a["href"])
        self.book_list = [self.root_url + i for i in self.book_list]
        self.book_list.remove('http://www.biquge5200.cc/')

    def get_chapter_list(self, url):
        res = self.get_url(url)
        html = BeautifulSoup(res, "html.parser")
        a_list = html.find_all("a", {"class": "chapter"})
        for a in a_list:
            self.chapter_list.append((a["href"], a.text.replace("\n", "")))

    def get_content(self, chapter):
        url = self.root_url + chapter[0]
        print(url)
        book_name = chapter[0].split("/")[1]
        print(book_name)
        if not os.path.exists(book_name):
            os.mkdir(book_name)
        res = self.get_url(url)
        html = BeautifulSoup(res, "html.parser")
        content = html.find("div", {"id": "content"}).text
        print(content)
        path = os.path.join(book_name, chapter[1])
        with open(path, "w", encoding="utf8") as f:
            f.write(content)

    def main(self):
        self.get_book_list()
        for book in self.book_list:
            self.get_chapter_list(book)
        for chapter in self.chapter_list:
            self.get_content(chapter)

if __name__ == '__main__':
    root_url = "http://www.biquge5200.cc/"
    nd = NovelDownloader(root_url)
    nd.main()

这样就可以更好地模拟浏览器发送请求，避免被网站屏蔽。另外，可以根据需要调整延时时间，以达到更好的效果。