The strip and split functions of Python

First,strip function prototype

declaration:S is a string,rm is a sequence of characters to be deleted

S.strip (RM) Remove The characters from the beginning and end of the S string in the RM delete sequence

S.lstrip (rm) Delete The character in the S string at the beginning of the RM Delete sequence

S.rstrip (RM) removes the character from the end of the S string that is located in the RM delete sequence

as follows :

>>> a= ' hheloooo goooodbyyyye ' >>> a.strip (' helo ') ' goooodbyyyy ' >>> a.strip (' he ') ' loooo Goooodbyyyy ' >>> a.strip (' o ') ' hheloooo Goooodbyyyye ' >>>

start looking for . first find ' h ' ' h ' minus , found the second ' H ' discover ' E ' [' H ', ' e ', ' l ', ' O '] inside , continue to remove ' e ',

from the tail start to find ' e ' in [' H ', ' e ', ' l ', ' O '], remove ' e ', and then find ' y ' not in [' H ', ' e ', ' l ' , ' O ') inside , so it stopped .

1, when rm is empty, the default is to remove the white space character (including ' \ n ', ' \ R ', ' \ t ', ')

>>> a= ' A\N\TBC ' >>> print a A bc>>> a.strip () ' A\N\TBC ' >>> a= ' abc ' >> ;> A.strip () ' abc ' >>> a= ' \n\tabc ' >>> a.strip () ' abc ' >>> a= ' abc\n\t ' >>> a.strip () ' ABC ' >>>

2, where the rm Delete sequence is deleted as long as the characters on the edge (beginning or end) are deleted in the sequence

>>> a= ' 123abc ' >>> a.strip (' + ') ' 3abc ' >>> a.strip (' + ') ' 3abc ' >>> a.strip (' 1a ') ' 23abc ' >>> A.strip (CB) Traceback (most recent): File "<stdin>", line 1, in <module>nameerror : Name ' CB ' is not defined>>> a.strip (' CB ') ' 123a ' >>> a.strip (' BC ') ' 123a ' >>>

second,split function

Split is a split function that splits a string into a "character" and is saved in a list.

>>> A= ' a b c d ' >>> a.split () [' A ', ' B ', ' C ', ' d ']

The default is a space split with no parameters. The reason for the "character" of double quotes, because the actual Python does not have characters.

>>> b= ' abc efg hij kkj ' >>> b.split () [' abc ', ' EFG ', ' hij ', ' kkj ']

can also be split with parameters according to actual requirements

>>> c= ' name=ding|age=25|job=it ' >>> c.split (' | ') [' name=ding ', ' age=25 ', ' Job=it ']>>> c.split (' | ') [0].split (' = ') [' name ', ' Ding ']

You can also take a number parameter, which means "cut a few knives" such as:

>>> d= ' A b c d e ' >>> d.split (', 1) #以空格 "Cut a knife", divided into two pieces [' A ', ' b c d e ']>>> d.split (', 2 ') [' A ', ' B ', ' C d e ']>>> d.split (' A ', ' 3 ') [' A ', ' B ', ' C ', ' d e ']>>> d.split (', ', -1 ') #d. Split (') as a result [' A ', ' B ', ' C ', ' d ', ' E ']>>> d.split (') [' A ', ' B ', ' C ', ' d ', ' e ']

This article is from the "Ding classmate 1990" blog, please be sure to keep this source http://dingtongxue1990.blog.51cto.com/4959501/1675499

The strip and split functions of Python