消除字符串两端和单词之间的所有空白。

>>> import re
>>> re.sub("\s+", # one or more repetition of whitespace
    '', # replace with empty string (->remove)
    ''' hello
...    apple
... ''')
'helloapple'

https://en.wikipedia.org/wiki/Whitespace_character

Python文档:

https://docs.python.org/library/stdtypes.html#textseq https://docs.python.org/library/stdtypes.html#str.replace https://docs.python.org/library/string.html#string.replace https://docs.python.org/library/re.html#re.sub https://docs.python.org/library/re.html#regular-expression-syntax

试试这个. .比起使用re，我认为使用split和strip会更好

def my_handle(self):
    sentence = ' hello  apple  '
    ' '.join(x.strip() for x in sentence.split())
#hello apple
    ''.join(x.strip() for x in sentence.split())
#helloapple

import re    
sentence = ' hello  apple'
re.sub(' ','',sentence) #helloworld (remove all spaces)
re.sub('  ',' ',sentence) #hello world (remove double spaces)

如果只删除空格，请使用str.replace:

sentence = sentence.replace(' ', '')

要删除所有空白字符(空格，制表符，换行符等)，可以使用split then join:

sentence = ''.join(sentence.split())

或者正则表达式:

import re
pattern = re.compile(r'\s+')
sentence = re.sub(pattern, '', sentence)

如果你只想从开头和结尾删除空白，你可以使用strip:

sentence = sentence.strip()

还可以使用lstrip删除字符串开头的空白，使用rstrip删除字符串末尾的空白。

小心:

Strip执行rstrip和lstrip(删除开头和结尾空格、制表符、返回值和表单提要，但不删除字符串中间的空格)。

如果你只替换空格和制表符，你最终会得到隐藏的crlf，它们看起来与你正在寻找的内容相匹配，但并不相同。

消除字符串两端和单词之间的所有空白。

>>> import re
>>> re.sub("\s+", # one or more repetition of whitespace
    '', # replace with empty string (->remove)
    ''' hello
...    apple
... ''')
'helloapple'

https://en.wikipedia.org/wiki/Whitespace_character

Python文档:

https://docs.python.org/library/stdtypes.html#textseq https://docs.python.org/library/stdtypes.html#str.replace https://docs.python.org/library/string.html#string.replace https://docs.python.org/library/re.html#re.sub https://docs.python.org/library/re.html#regular-expression-syntax