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" 

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.

" ".join(foo.split())对于所问的问题不太正确，因为它也完全删除了单个前导和/或尾随空格。所以，如果它们也将被1个空白替换，你应该像下面这样做:

" ".join(('*' + foo + '*').split()) [1:-1]

当然，它没有那么优雅。

最简单的解决方案!

a = 'The   fox jumped   over    the log.'
while '  ' in a: a = a.replace('  ', ' ')
print(a)

输出:

The fox jumped over the log.

一个简单的灵魂

>>> import re
>>> s="The   fox jumped   over    the log."
>>> print re.sub('\s+',' ', s)
The fox jumped over the log.

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。