为何下载下来的图片是错位失真的
代码：
import urllib2
import re
req = urllib2.urlopen('https://www.imooc.com/course/list')
buf = req.read()
image_link = re.findall(r'//img.+\.(?:jpg|png)',buf)
print image_link
print len(image_link)
i = 0
for url in image_link:
print url
f = open(str(i)+'.jpg','w')
req = urllib2.urlopen('http:'+url)
buf = req.read()
f.write(buf)
i+=1下载图片共42张，大部分效果如下：
