python利用urllib爬虫，图片获取二十几张后就报错
python版本3.6 windows系统下运行

urllib.error.URLError:<urlopen error no host given>

代码如下：

#!/usr/bin/python
# -*- coding:utf-8 -*-
import urllib
import requests
import re
from bs4 import BeautifulSoup
import csv
import socket 
socket.setdefaulttimeout(300)
headers = {"User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36"}

#url池
url1 = ('http://jandan.net/ooxx/page-')
urls = []
src_list = []
for i in range(2000,2020):
    
    urls.append(url1+str(i))
print (urls)  
for url in urls:#从url池中获取url
    r = requests.get(url,headers = headers)#获取页面
    html = BeautifulSoup(r.text,'html.parser')#利用tag结构划分#获取名称
    
    
    for link in html.find_all('img'):
        src_list.append('http:'+link.get('src'))
                

src_list.pop()
print (src_list)

tmp = 1        
for src in src_list:
    urllib.request.urlretrieve(src,r'C:\Users\姜梦天\Desktop\spider\img\%s.jpg' % tmp)
    tmp += 1
    
print ('下载完毕')


.....尝试解决未果...
求各位大大DEBUG....