跟着视频写的一个爬虫，但是执行报错，大佬们帮忙看看是什么情况
# coding = utf-8import sys
from bs4 import BeautifulSoup
import re #正则表达式，进行文字匹配
import urllib.request,urllib.error #指定url获取网页数据
import sqlite3 #进行sqlite数据库操作
def main():
baseurl = 'https://movie.douban.com/top250?start='
datalist = getdata(baseurl)
savepath = './豆瓣电影top250.xls'
# savedata(savepath)
#askURL(url)
#爬取网页
def getdata(baseurl):
datalist = []
for each in range(0,10): #调用获取页面信息的函数,10次(一页25条。）
url = baseurl + str(each*25)
html = askURL(url)
sp = BeautifulSoup(html,'html.parser')
for i in sp.find_all('div',class_="item",limit=10):
datalist.append(i)
print(datalist)
return datalist
#2.逐一解析数据
#得到指定一个url的网页内容
def askURL(url):#模拟浏览器头部信息，向豆瓣服务器发送消息
header = {"User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36"}
#用户代理，表示告诉豆瓣服务器，我们时什么类型的机器，浏览器（本质上是告诉浏览器，我们可以接收什么水平的内容
req = urllib.request.Request(url=url,headers=header)
html = ""
try:
response = urllib.request.urlopen((req))
html = response.read().decode("utf-8")
#print(html)
except urllib.error.URLError as e:
if hasattr(e,'code'):
print(e.code)
if hasattr(e,'reason'):
print(e.reason)
#returnhtml
def savedata(savepath):
#3.保存数据
pass
报错信息为：Traceback (most recent call last):
File "C:/Users/Administrator/Desktop/计算机/python/豆瓣爬虫项目/main.py", line 57, in <module>
main()
File "C:/Users/Administrator/Desktop/计算机/python/豆瓣爬虫项目/main.py", line 12, in main
datalist = getdata(baseurl)
File "C:/Users/Administrator/Desktop/计算机/python/豆瓣爬虫项目/main.py", line 24, in getdata
sp = BeautifulSoup(html,'html.parser')
File "C:\Users\Administrator\Desktop\计算机\venv\lib\site-packages\bs4\__init__.py", line 310, in __init__
elif len(markup) <= 256 and (
TypeError: object of type 'NoneType' has no len()
Process finished with exit code 1
OK，没事了，是我自己脑淤血把askurl函数的返回值打成注释了{:5_107:}
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