Question

这段抓取instapaper的python代码有什么问题，运行提示TypeError: 'NoneType' object is not iterable

def parse_index(self):
totalfeeds = []
lfeeds = self.get_feeds()

for feedobj in lfeeds:
feedtitle, feedurl = feedobj
articles = []

#folder page
current_page = 1

#so we run the first time
articles_on_page = 1

#download articles while they are available and we don't have enough to satisfy max_articles_per_feed
while (articles_on_page>0 and len(articles)<self.max_articles_per_feed):
self.report_progress(0, _('Fetching feed')+' %s (%d)...'%((feedtitle if feedtitle else feedurl), current_page))
soup = self.index_to_soup(feedurl+u'/'+str(current_page))

#get and count number of items on current page
items = soup.findAll('a', attrs={'class':'actionButton textButton'})
articles_on_page = len(items)

# Go through each item, (each item is the 'Text' link) looking
# for the archive link, and secondary information (for
# description and date)
for item in items:
if item.has_key('href'):
article = {'url':item['href']}
if len(totalfeeds)==0:
return None
else:
return totalfeeds
中间省略了，关键是最后这几句，是不是返回值有问题？

Answer 1

您好，给你点拨一下,你的"-H"传递给process了么？:
PYTHON subprocess API里面有个communicate函数 可以传递输入（stdin）。

给你一个例子，希望你可以理解，test3传递了输入给test1，test1输出了接收到的参数。
test1：
import sys

input = sys.stdin.read()
sys.stdout.write('Received: %s'%input)

test3：
import subprocess
process = subprocess.Popen(['python', 'test1.py'], shell=False, stdin=subprocess.PIPE)
print process.communicate('How are you?')
领悟一下，获取process的输出你会的吧。