从列表中删除不在 'speeches' 中的项目？

Question

url = 'http://www.millercenter.org/president/speeches'

conn = urllib2.urlopen(url)
html = conn.read()

miller_center_soup = BeautifulSoup(html)
links = miller_center_soup.find_all('a')

linklist = [tag.get('href') for tag in links if tag.get('href') is not None]
linklist = str(linklist)

end_of_links = [line for line in linklist if '/events/' in line]
print end_of_links

这是我输出的一小段（保存在 Python 列表中）。

['/events/2015/one-nation-under-god-how-corporate-america-invented-christian-america', 
'/events/2015/a-conversation-with-bernie-sanders', '#reagan', '#gwbush', '#obama',
'#top', '/president/obama/speeches/speech-4427', president/obama/speeches/speech-4430', ...]

我想删除列表中不包含 speeches 的所有项目。我试过 filter() 并只是创建了另一个列表理解，但这还没有奏效。我不知道为什么 end_of_links 变量不起作用 - 至少对我来说这似乎很直观。

Answer 1

必须保留做的那些包括'speeches':

link_list = ['/events/2015/one-nation-under-god-how-corporate-america-invented-christian-america',
 '/events/2015/a-conversation-with-bernie-sanders', '#reagan', '#gwbush', '#obama',
 '#top', '/president/obama/speeches/speech-4427', 'president/obama/speeches/speech-4430']
speech_list = [_ for _ in link_list if 'speeches' in _]

这是我的终端会话，在 Python2.7

>>> link_list = ['/events/2015/one-nation-under-god-how-corporate-america-invented-christian-america',
...  '/events/2015/a-conversation-with-bernie-sanders', '#reagan', '#gwbush', '#obama',
...  '#top', '/president/obama/speeches/speech-4427', 'president/obama/speeches/speech-4430']
>>> speech_list = [_ for _ in link_list if 'speeches' in _]
>>> speech_list
['/president/obama/speeches/speech-4427', 'president/obama/speeches/speech-4430']
>>>

Answer 2

li = ['/events/2015/one-nation-under-god-how-corporate-america-invented-christian-america', '/events/2015/a-conversation-with-bernie-sanders', '#reagan', '#gwbush', '#obama', '#top', '/president/obama/speeches/speech-4427', 'president/obama/speeches/speech-4430']

重新导入

li = [ x for x in li if re.search('speeches',x)]

打印(li)

['/president/obama/speeches/speech-4427', 'president/obama/speeches/speech-4430']

从列表中删除不在 'speeches' 中的项目？

Remove items from list not in 'speeches'?

python

list

trim

python-2.7