从python列表中删除'\\ n \\ n \\ n'，'\\ n'

Question

How can I remove '\\n\\n\\n' , '\\n' , u'\\xa0' from the array below?

list = ['\n\n\n', '\n', '1', '2', '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n', u'\xa0', '\n', u'\xa0\xa0', '\n', '3']

I have tried .remove("'\\n'") but I get the error message: list.remove(x): x not in list

Answer 1

使用数组理解：

[x for x in list if not x.isspace() and u'\\xa0' not in x]

Answer 2

Instead of targeting the non-alphanumeric characters, search for the alphanumeric characters themselves:

import re
l = ['\n\n\n', '\n', '1', '2', '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n', u'\xa0', '\n', u'\xa0\xa0', '\n', '3']
new_l = filter(lambda x:re.findall('^[a-zA-Z0-9]+$', x), l)

Output:

['1', '2', '3']

Answer 3

I wouldnt name the list list better something like:

 l = ['\n\n\n', '\n', '1', '2', '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n', '\n', u'\xa0', '\n', u'\xa0\xa0', '\n', '3']

Then you can try filter :

 > list(filter(lambda x: '\n' not in x and u'\xa0' not in x, l))
 > ['1', '2', '3']