python拆分空字符串

发布时间：2020-12-20 11:41:25 所属栏目：Python 来源：网络整理

导读：参见英文答案 When splitting an empty string in Python,why does split() return an empty list while split(‘n’) returns [”]?????????????????????????????????????6个有人可以在python 2.7.8上解释这个行为： Python 2.7.8 (default,Nov 12 2014,0

参见英文答案 > When splitting an empty string in Python,why does split() return an empty list while split(‘n’) returns [”]?????????????????????????????????????6个
有人可以在python 2.7.8上解释这个行为：

Python 2.7.8 (default,Nov 12 2014,02:03:09)
[GCC 4.8.2 20140120 (Red Hat 4.8.2-16)] on linux2
Type "help","copyright","credits" or "license" for more information.
>>> a = ''
>>> a.split()
[]
>>> a.split('n')
['']

由任何空格分割得到一个空列表,但是用新行分割会给出一个带有空字符串的列表.为什么？

谢谢

解决方法

基于 python wiki：

str.split([sep[,maxsplit]])

If sep is given,consecutive delimiters are not grouped together and are deemed to delimit empty strings (for example,'1,2'.split(',') returns ['1','','2']). The sep argument may consist of multiple characters (for example,'1<>2<>3'.split('<>') returns ['1','2','3']). Splitting an empty string with a specified separator returns [''].

If sep is not specified or is None,a different splitting algorithm is applied: runs of consecutive whitespace are regarded as a single separator,and the result will contain no empty strings at the start or end if the string has leading or trailing whitespace. Consequently,splitting an empty string or a string consisting of just whitespace with a None separator returns [].

有关更多解释,请阅读此答案https://stackoverflow.com/a/16645307/2867928

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