我不得不同意Paul McGuire的评论。对我来说,

' '.join(the_string.split())

比快速生成正则表达式要好得多。

我的测量结果(Linux和Python 2.5)显示，先分离后连接的速度几乎比“re.sub(…)”快5倍，如果你一次预编译正则表达式并多次执行该操作，速度仍然快3倍。而且无论从哪方面看，它都更容易理解——更python化。

import re

Text = " You can select below trims for removing white space!!   BR Aliakbar     "
  # trims all white spaces
print('Remove all space:',re.sub(r"\s+", "", Text), sep='') 
# trims left space
print('Remove leading space:', re.sub(r"^\s+", "", Text), sep='') 
# trims right space
print('Remove trailing spaces:', re.sub(r"\s+$", "", Text), sep='')  
# trims both
print('Remove leading and trailing spaces:', re.sub(r"^\s+|\s+$", "", Text), sep='')
# replace more than one white space in the string with one white space
print('Remove more than one space:',re.sub(' +', ' ',Text), sep='') 

结果:作为代码

"Remove all space:Youcanselectbelowtrimsforremovingwhitespace!!BRAliakbar"
"Remove leading space:You can select below trims for removing white space!!   BR Aliakbar"     
"Remove trailing spaces: You can select below trims for removing white space!!   BR Aliakbar"
"Remove leading and trailing spaces:You can select below trims for removing white space!!   BR Aliakbar"
"Remove more than one space: You can select below trims for removing white space!! BR Aliakbar" 

string = 'This is a             string full of spaces          and taps'
string = string.split(' ')
while '' in string:
    string.remove('')
string = ' '.join(string)
print(string)

结果:

这是一个充满空格和点击的字符串

这个正是你想要的

old_string = 'The   fox jumped   over    the log '
new_string = " ".join(old_string.split())
print(new_string)

将会导致

The fox jumped over the log.

>>> import re
>>> re.sub(' +', ' ', 'The     quick brown    fox')
'The quick brown fox'

我尝试过下面的方法，它甚至适用于极端的情况，比如:

str1='          I   live    on    earth           '

' '.join(str1.split())

但如果你更喜欢正则表达式，它可以这样做:

re.sub('\s+', ' ', str1)

尽管必须进行一些预处理以删除尾随和结束空格。