大体思路：

1. 分析糗百url格式 https://www.qiushibaike.com/8hr/page/2/，发现需要变动的就是page后面的数字，故应该将该占位符的页码值进行动态赋值
2. 封装三个函数，功能分别为下载get_html()、保存save_html()、主程序运行main()
3. 涉及模块知识点：urllib.request.Request类的使用，urllib.request.urlopen方法的使用

代码如下：

-- coding: utf-8 --
# @author : JackYoung
# @date : 2018-03-29 16:24:03
# @email : chuzhu2010@163.com
# @link : http://www.jianshu.com/u/05b01810625

import os
from urllib.request import Request
from  urllib.request import urlopen
import random

def get_html(url, filename):
    '''
    :param url: 要下载的url
    :param filename: 将要保存的文件名
    :return: html 下载的内容
    '''
    print("正在下载" + filename)
    User_Agent_list = [
        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36",
        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36 Edge/15.15063",
        "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.104 Safari/537.36 Core/1.53.4882.400 QQBrowser/9.7.13059.400", ]
    header = {
        "User-Agent": random.choice(User_Agent_list)
    }
    # 构造Request对象
    request = Request(url, headers=header)
    # 发送请求
    response = urlopen(request)
    return response.read()


def save_html(html, filename):
    '''
    :param html: 保存的内容
    :param filename: 保存的文件名
    :return: 
    '''
    print("正在保存" + filename)
    base_dir = os.path.join(os.getcwd(), '糗事百科')
    file_path = os.path.join(base_dir, filename)
    with open(file_path, "wb") as f:
        f.write(html)


def main(num):
    '''
    :param num: 要获取的糗百总页数
    :return: 
    '''
    # 构造基本url，动态赋值
    base_url = "http://www.qiushibaike.com/8hr/page/{}/"
    # 遍历页面，分别赋值
    for i in range(num):
        pn = i + 1
        # 拼接参数
        url = base_url.format(pn)
        print(url)
        # 拼接文件名
        filename = "糗事百科第" + str(pn) + "页.html"
        # 获取页面
        html = get_html(url, filename)
        # 保存页面
        save_html(html, filename)
    print("下载完成")


if __name__ == "__main__":
    num = input("请输入爬取糗百的总页数：")
    main(int(num))

运行结果如下：##

页面
image