blocks|key|1382872|text|一个起点..(尽管它并不比手动组装空白马戏团短)+..|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1382873|>>>+from+string+import+whitespace+as+ws
>>>+import+re

>>>+p+=+re.compile('(%25s)'+%25+('%7C'.join([c+for+c+in+ws])))
>>>+s+=+"Please+\n+don't+\t+hurt+\x0b+me."

>>>+p.sub('',+s)
"Pleasedon'thurtme."|code-block|syntax|javascript|1382874|或者，如果您想要将空格减少到最多一个：|1382875|>>>+p1+=+re.compile('(%25s)'+%25+('%7C'.join([c+for+c+in+ws+if+not+c+==+'+'])))
>>>+p2+=+re.compile('+%2B')
>>>+s+=+"Please+\n+don't+\t+hurt+\x0b+me."

>>>+p2.sub('+',+p1.sub('',+s))
"Please+don't+hurt+me."|1382876|第三，更紧凑：|1382877|>>>+import+string

>>>+s+=+"Please+\n+don't+\t+hurt+\x0b+me."
>>>+s.translate(None,+string.whitespace[])
"Pleasedon'thurtme."

>>>+s.translate(None,+string.whitespace[:5])
"Please++don't++hurt++me."

>>>+'+'.join(s.translate(None,+string.whitespace[:5]).split())
"Please+don't+hurt+me."|1382878|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

a starting point .. (although it's not shorter than manually assembling the whitespace circus) ..

<pre><code>&gt;&gt;&gt; from string import whitespace as ws
&gt;&gt;&gt; import re

&gt;&gt;&gt; p = re.compile('(%s)' % ('|'.join([c for c in ws])))
&gt;&gt;&gt; s = "Please \n don't \t hurt \x0b me."

&gt;&gt;&gt; p.sub('', s)
"Pleasedon'thurtme."
</code></pre>

Or if you want to reduce whitespace to a maximum of one:

<pre><code>&gt;&gt;&gt; p1 = re.compile('(%s)' % ('|'.join([c for c in ws if not c == ' '])))
&gt;&gt;&gt; p2 = re.compile(' +')
&gt;&gt;&gt; s = "Please \n don't \t hurt \x0b me."

&gt;&gt;&gt; p2.sub(' ', p1.sub('', s))
"Please don't hurt me."
</code></pre>

Third way, more compact:

<pre><code>&gt;&gt;&gt; import string

&gt;&gt;&gt; s = "Please \n don't \t hurt \x0b me."
&gt;&gt;&gt; s.translate(None, string.whitespace[])
"Pleasedon'thurtme."

&gt;&gt;&gt; s.translate(None, string.whitespace[:5])
"Please don't hurt me."

&gt;&gt;&gt; ' '.join(s.translate(None, string.whitespace[:5]).split())
"Please don't hurt me."
</code></pre>

blocks|key|1167975|text|您可以使用translate方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1167976|import+string

s+=+"Please+\n+don't+\t+hurt+\x0b+me."
s+=+s.translate(None,+string.whitespace[:-1])+#+python+2.6+and+up
s+=+s.translate(string.maketrans('',''),+string.whitespace[:-1])+#+python+2.5,+dunno+further+down
>>>+s
"Please++don't++hurt++me."|code-block|syntax|javascript|1167977|然后删除重复的空格|1167978|s.replace('++',+'+')
>>>+s
"Please+don't+hurt+me."|1167979|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You could use the translate method

<pre><code>import string

s = "Please \n don't \t hurt \x0b me."
s = s.translate(None, string.whitespace[:-1]) # python 2.6 and up
s = s.translate(string.maketrans('',''), string.whitespace[:-1]) # python 2.5, dunno further down
&gt;&gt;&gt; s
"Please don't hurt me."
</code></pre>

And then remove duplicate whitespace

<pre><code>s.replace(' ', ' ')
&gt;&gt;&gt; s
"Please don't hurt me."
</code></pre>

blocks|key|1382989|text|对于这个用例，有一个特殊情况下的快捷方式！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1382990|如果在不带参数的情况下调用str.split，它将在一系列空格上拆分，而不是在单个字符上拆分。所以：|offset|length|style|CODE|1382991|>>>+'+'.join("Please+\n+don't+\t+hurt+\x0b+me.".split())
"Please+don't+hurt+me."|code-block|syntax|javascript|1382992|entityMap^0|0|D|9|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|S|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

There is a special-case shortcut for exactly this use case!

If you call <code>str.split</code> without an argument, it splits on runs of whitespace instead of single characters. So:

<pre><code>&gt;&gt;&gt; ' '.join("Please \n don't \t hurt \x0b me.".split())
"Please don't hurt me."
</code></pre>

blocks|key|1383033|text|\s字符类有什么问题？|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1383034|>>>+import+re

>>>+pattern+=+re.compile(r'\s%2B')
>>>+re.sub(pattern,+'+',+"Please+\n+don't+\t+hurt+\x0b+me.")
"Please+don't+hurt+me."|code-block|syntax|javascript|1383035|entityMap^0|0|2|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

What's wrong with the <code>\s</code> character class?

<pre><code>&gt;&gt;&gt; import re

&gt;&gt;&gt; pattern = re.compile(r'\s+')
&gt;&gt;&gt; re.sub(pattern, ' ', "Please \n don't \t hurt \x0b me.")
"Please don't hurt me."
</code></pre>

blocks|key|1168123|text|让我们做一些合理的假设：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1168124|(1)您确实希望用一个空格替换任何一串空格字符(一个空格的长度为1或更长)。|1168125|(2)您希望相同的代码在Python+2.X下使用unicode对象进行最小程度的更改。|1168126|(3)您不希望您的代码假定文档中没有保证的内容|1168127|(4)您希望在Python3.x+str对象中使用相同的代码，并且只需进行最少的更改。|1168128|当前选择的答案存在以下问题：|1168129|(a)将"+"+*+3更改为"+"+*+2，即删除重复的空格，但不删除三重、四重等空格。未通过要求1|offset|length|style|CODE|1168130|(b)将"foo\tbar\tzot"更改为"foobarzot"不符合要求1|1168131|(c)当输入unicode对象时，获取TypeError:+translate()+takes+exactly+one+argument+(2+given)不符合要求2|1168132|(d)使用string.whitespace[:-1]不符合要求3；不保证string.whitespace中字符的顺序|1168133|(e)使用string.whitespace[:-1]不符合要求4；在Python2.x中，string.whitespace是'\t\n\x0b\x0c\r+'；在Python3.x中，它是‘\t\n\r\x0b\x0c’|1168134|"+".join(s.split())答案和re.sub(r"\s%2B",+"+",+s)答案没有这些问题。|1168135|entityMap^0|0|0|0|0|0|0|4|7|E|7|0|4|F|M|B|0|J|1N|0|5|M|0|5|M|1S|H|0|0|J|M|M|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|14|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|15|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|16|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|17|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|18|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|19|8|@$N|1A|O|1B|P|Q]|$N|1C|O|1D|P|Q]]|9|@]|A|$]]|$1|R|3|S|5|6|7|1E|8|@$N|1F|O|1G|P|Q]|$N|1H|O|1I|P|Q]]|9|@]|A|$]]|$1|T|3|U|5|6|7|1J|8|@$N|1K|O|1L|P|Q]]|9|@]|A|$]]|$1|V|3|W|5|6|7|1M|8|@$N|1N|O|1O|P|Q]]|9|@]|A|$]]|$1|X|3|Y|5|6|7|1P|8|@$N|1Q|O|1R|P|Q]|$N|1S|O|1T|P|Q]]|9|@]|A|$]]|$1|Z|3|10|5|6|7|1U|8|@$N|1V|O|1W|P|Q]|$N|1X|O|1Y|P|Q]]|9|@]|A|$]]|$1|11|3|-4|5|6|7|1Z|8|@]|9|@]|A|$]]]|12|$]]

Let's make some reasonable assumptions:

(1) You really want to replace any run of whitespace characters with a single space (a run is of length 1 or greater).

(2) You would like the same code to work with minimal changes under Python 2.X with unicode objects.

(3) You don't want your code to assume things that are not guaranteed in the docs

(4) You would like the same code to work with minimal changes with Python 3.X str objects.

The currently selected answer has these problems:

(a) changes <code>" " * 3</code> to <code>" " * 2</code> i.e. it removes duplicate spaces but not triplicate, quadruplicate, etc spaces. [fails requirement 1]

(b) changes <code>"foo\tbar\tzot"</code> to <code>"foobarzot"</code> [fails requirement 1]

(c) when fed a unicode object, gets <code>TypeError: translate() takes exactly one argument (2 given)</code> [fails requirement 2]

(d) uses <code>string.whitespace[:-1]</code> [fails requirement 3; order of characters in string.whitespace is not guaranteed]

(e) uses <code>string.whitespace[:-1]</code> [fails requirement 4; in Python 2.X, string.whitespace is <code>'\t\n\x0b\x0c\r '</code>; in Python 3.X, it is ' \t\n\r\x0b\x0c']

The <code>" ".join(s.split())</code> answer and the <code>re.sub(r"\s+", " ", s)</code> answer don't have these problems.

Python's string.whitespace is great:

<pre><code>&gt;&gt;&gt; string.whitespace
'\t\n\x0b\x0c\r '
</code></pre>

How do I use this with a string without resorting to manually typing in '\t|\n|... etc for regex? 

For example, it should be able to turn:
"Please \n don't \t hurt \x0b me."

into

"Please don't hurt me."

I'd probably want to keep the single spaces, but it'd be easy enough to just go string.whitespace[:-1] I suppose.

Remove whitespace in Python using string.whitespace

Python

Python的string.whitespace很棒：>>> string.whitespace'\t\n\x0b\x0c\r '如何将其与字符串一起使用，而无需手动键入'\t|\n|...正则表达式等？例如，它应该能够转向：“请不要伤害我。”转到“请不要伤害我”我可能想保留单个空格，但只使用字符串就足够简单了。

问使用string.whitespace删除Python中的空格
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