如何在Python中删除带或不带空格的空行
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How to remove empty lines with or without whitespace in Python
提问by
I have large string which I split by newlines. How can I remove all lines that are empty, (whitespace only)?
我有大字符串，我用换行符分割。如何删除所有空行（仅限空格）？
pseudo code:
伪代码：
for stuff in largestring:
remove stuff that is blank
采纳答案by NullUserException
回答by gimel
Try list comprehension and string.strip():
尝试列表理解和string.strip()：
>>> mystr = "L1\nL2\n\nL3\nL4\n \n\nL5"
>>> mystr.split('\n')
['L1', 'L2', '', 'L3', 'L4', ' ', '', 'L5']
>>> [line for line in mystr.split('\n') if line.strip() != '']
['L1', 'L2', 'L3', 'L4', 'L5']
回答by nmichaels
Edit: Wow, I guess omitting the obvious isn't okay.
编辑：哇，我想省略显而易见的事情是不行的。
lines = bigstring.split()
lines = [line for line in lines if line.strip()]
回答by Regisz
I also tried regexp and list solutions, and list one is faster.
我还尝试了 regexp 和 list 解决方案，并且list one is fast。
Here is my solution (by previous answers):
这是我的解决方案（根据以前的答案）：
text = "\n".join([ll.rstrip() for ll in original_text.splitlines() if ll.strip()])
回答by Ooker
If you are not willing to try regex (which you should), you can use this:
如果你不愿意尝试正则表达式（你应该这样做），你可以使用这个：
s.replace('\n\n','\n')
Repeat this several times to make sure there is no blank line left. Or chaining the commands:
重复几次以确保没有空行。或者链接命令：
s.replace('\n\n','\n').replace('\n\n','\n')
Just to encourage you to use regex, here are two introductory videos that I find intuitive:
? Regular Expressions (Regex) Tutorial
? Python Tutorial: re Module
只是为了鼓励您使用正则表达式，这里有两个介绍影片，我觉得直观的：
？正则表达式（Regex）教程
？Python 教程：re 模块
回答by Radren
My version:
我的版本：
while '' in all_lines:
all_lines.pop(all_lines.index(''))
回答by Radren
while True:
try:
all_lines.remove('')
except ValueError:
break
回答by Kashem Ali
komodo edit remove blank lines
In komodo edit press Ctrl+H Star Mark (Treat as regex), Click above link to view snapshot.
在 komodo 编辑中按 Ctrl+H 星标（视为正则表达式），单击上面的链接查看快照。
回答by Reihan_amn
Same as what @NullUserException said, this is how I write it:
与@NullUserException 所说的相同，我是这样写的：
removedWhitespce = re.sub(r'^\s*$', '', line)
回答by mushuweasel
Surprised a multiline re.sub has not been suggested (Oh, because you've already split your string... But why?):
惊讶的是没有建议多行 re.sub（哦，因为你已经拆分了你的字符串......但为什么呢？）：
>>> import re
>>> a = "Foo\n \nBar\nBaz\n\n Garply\n \n"
>>> print a
Foo
Bar
Baz
Garply
>>> print(re.sub(r'\n\s*\n','\n',a,re.MULTILINE))
Foo
Bar
Baz
Garply
>>>
