List of articles

• split()
• • split Four splitting rules
• rsplit()
• splitlines()
• • splitlines And split The difference between
• Reference material

split()

split() Function basic format ：

split(sep=None, maxsplit=-1)
Returns a list of words in a string , Use sep As a separate string .
If given maxsplit, At most maxsplit Sub resolution （ therefore , The list will have at most maxsplit+1 Elements ）.
If maxsplit Not specified or is -1, The number of splits is not limited （ Make all possible splits ）.

seq The delimited string defaults to None,maxsplit The default indicates that the number of splits is not limited .
split() Return to one list

split Four splitting rules

situation 1： to `sep``： basis sep Split all strings

'a.bc'.split('.')
['a', 'bc']

situation 2： to sep, to maxsplit： basis sep For strings, follow maxsplit Value of to split

'a.b.c'.split('.',maxsplit=1)
['a', 'b.c']

situation 3： If sep Not specified or is None： Consecutive spaces are treated as a single separator , The result will not contain an empty string at the beginning or end , If the string contains prefix or suffix spaces .

'1 2 3'.split()
#['1', '2', '3']
'1 2 3'.split(maxsplit=1)
#['1', '2 3']
' 1 2 3 '.split()
#['1', '2', '3']

situation 4： Handle consecutive delimiters ： Consecutive delimiters are not grouped together but are treated as Separate empty strings

'a.b..c'.split('.')
['a', 'b', '', 'c']

rsplit()

rsplit（） The basic format :

rsplit(sep=None, maxsplit=- 1)
Returns a list of words in a string , Use sep As a separate string .
If given maxsplit, At most maxsplit Sub resolution , from Far right Start .

And split() function The difference between ：rsplit() from Far right Start splitting
rsplit() The rest of the actions and split() identical

splitlines()

splitlines() The basic format :

splitlines(keepends=False)
Returns a list of lines in the original string , Split at the line boundary .
The result list does not contain row boundaries , Unless you give keepends And it's true .

situation 1： Default splitlines()

'ab c\n\nde fg\rkl\r\n'.splitlines()
#['ab c', '', 'de fg', 'kl']

situation 2： Include row boundaries keepends = True

'ab c\n\nde fg\rkl\r\n'.splitlines(keepends=True)
#['ab c\n', '\n', 'de fg\r', 'kl\r\n']

splitlines And split The difference between

When a delimited string is given sep when , For an empty string, this method returns an empty list ; A newline at the end does not add extra lines to the result .

"".splitlines()
#[]
"One line\n".splitlines()
#['One line']

As a comparison ,split('\n') As the result of the :

''.split('\n')
#['']
'Two lines\n'.split('\n')
#['Two lines', '']

Reference material

Built in type -split:https://docs.python.org/zh-cn/3/library/stdtypes.html?highlight=split