2011-04-01 105 views
1

我对python相当陌生。我有一个我需要了解的错误。Python - 了解错误:IndexError:列表索引超出范围

代码:

config.py:

# Vou definir os feeds 
feeds_updates = [{"feedurl": "http://aaa1.com/rss/punch.rss", "linktoourpage": "http://www.ha.com/fun.htm"}, 
       {"feedurl": "http://aaa2.com/rss.xml", "linktoourpage": "http://www.ha.com/fun.htm"}, 
       {"feedurl": "http://aaa3.com/Heaven", "linktoourpage": "http://www.ha.com/fun.htm"}, 
       {"feedurl": "http://aaa4.com/feed.php", "linktoourpage": "http://www.ha.com/fun.htm"}, 
       {"feedurl": "http://aaa5.com/index.php?format=feed&type=rss", "linktoourpage": "http://www.ha.com/fun.htm"}, 
       {"feedurl": "http://aaa6.com/rss.xml", "linktoourpage": "http://www.ha.com/fun.htm"}, 
       {"feedurl": "http://aaa7.com/?format=xml", "linktoourpage": "http://www.ha.com/fun.htm"}, 
       {"feedurl": "http://aaa8/site/component/rsssyndicator/?feed_id=1", "linktoourpage": "http://www.ha.com/fun.htm"}] 

twitterC.py

# -*- coding: utf-8 -*- 
import config # Ficheiro de configuracao 
import twitter 
import random 
import sqlite3 
import time 
import bitly_api #https://github.com/bitly/bitly-api-python 
import feedparser 

... 

# Vou escolher um feed ao acaso 
feed_a_enviar = random.choice(config.feeds_updates) 
# Vou apanhar o conteudo do feed 
d = feedparser.parse(feed_a_enviar["feedurl"]) 
# Vou definir quantos feeds quero ter no i 
i = range(8) 
print i 
# Vou meter para "updates" 10 entradas do feed 
updates = [] 
for i in range(8): 
    updates.append([{"url": feed_a_enviar["linktoourpage"], "msg": d.entries[i].title + ", "}]) 
# Vou escolher ums entrada ao acaso 
print updates # p debug so 
update_to_send = random.choice(updates) 

print update_to_send # Para efeitos de debug 

而这有时会出现由于随机性质的错误:

Traceback (most recent call last): 
    File "C:\Users\anlopes\workspace\redes_sociais\src\twitterC.py", line 77, in <module> 
    updates.append([{"url": feed_a_enviar["linktoourpage"], "msg": d.entries[i].title + ", "}]) 
IndexError: list index out of range 

I'am没有得到的错误,列表“feeds_updates”是一个包含8个元素的列表,我认为是很好的声明,RANDOM会从8个列表中选择一个...

有人可以给我一些线索,这里? PS:对不起,我的英语不好。

此致

+0

您知道索引从零开始? 8个元素的索引为0到7? – 2011-04-01 10:09:27

+0

@S。洛特:'范围(8)'是'[0,1,2,3,4,5,6,7]',所以这不是问题。 – 2011-04-01 10:50:25

+0

@Tim Pietzcker:当然,我们都假设在'feed_updates'列表中实际提供的代码有8个项目,对吗?是的,证据是好的,但必须有一些事情没有在所提供的代码片段中显示。 – 2011-04-01 11:02:51

回答

5

使用range进行迭代几乎总是不是最好的方法。在Python中,你可以在一个列表直接迭代,快译通,设置等:

for item in d.entries: 
    updates.append([{"url": feed_a_enviar["linktoourpage"], "msg": item.title + ", "}]) 

显然d.entries[i]因为列表包含小于8个项目(feeds_updates可能包含8个,但你是不是遍历该列表触发错误)。

2

d.entries具有小于8个元素。直接迭代d.entries而不是某些断开的范围。

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