python小说爬虫 缺少必须位置参数，求大佬解答

#源码在此

# -*- coding:utf-8 -*-
import requests,sys
from bs4 import BeautifulSoup


class downloader (object):

    def __init__(self):
        self.names = []           #存放章节名
        self.urls = []            #存放章节链接
        self.nums = ()            #章节数

        self.target = 'https://www.biquge5200.cc/84_84888/'

    def get_url(self):
        req = requests.get(url =self.target)
        html = req.text
        div_bf = BeautifulSoup(html)
        div = div_bf.find_all('div', id='list')
        a_bf = BeautifulSoup(str(div[0]))
        a = a_bf.find_all('a')
        self.nums = len(a)

        for each in a:
            # print(each.string, each.get('href'))
            self.names.append (each.string)
            self.urls.append (each.string, each.get('href'))


    def get_content (self,targer):
        header = {
            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) '
                          'AppleWebKit/537.36 (KHTML, like Gecko) '
                          'Chrome/61.0.3163.79 Safari/537.36'
        }
        content = requests.get(url = targer,headers=header)
        # content = content.encode ('iso-8859-1')
        html = content.text
        bf = BeautifulSoup(html)
        text = bf.find_all(id = 'content')
        texts = text[0].text.replace('</p><p>'*2,'\n')
        return texts


    def write_in (self,name,path,texts):
        write_flag = True
        with open('超品巫师'+'.txt',encoding='utf-8')as f:
            f.write(name + '\n')
            f.writelines(texts)
            f.write('\n\n')

if __name__ == "__main__":
    dl = downloader
    downloader.get_url()
    print('The page is loading, please wait...')
    for i in range(dl.nums):
        dl.write_in(dl.names[i],'超品巫师.txt',dl.get_content(dl.urls[i]))
        sys.stdout.write ("  已下载:%.3f%%" %  float(i/dl.nums) + '\r')
        sys.stdout.flush()
        # print(flush = True)
        print('Mission completed')

下面是错误信息

代码错误较多。1.代码中所有的BeautifulSoup函数参数要添加参数features='xlml' 或‘html.parser’ ;

2.get_url方法中最后一句，self.urls.append (each.string, each.get('href'))错误，append只能有一个参数,改成：self.urls.append (each.string+','+ each.get('href'))

3.在main函数中,类对象的实例化错误，改为：dl=downloader(),dl.get_url(),在for循环中第一句中调用函数dl.get_content()时传递的参数不正确，按第二条中self.urls的形式，作出更改：dl.urls[i].split(',')[-1]

4.不能过于频繁调用，在循环中加入休眠时间。