The join () function in Python split () function

Function: String.Join ()

Python has join () and Os.path.join () two functions, which work as follows:
Join (): An array of connection strings. Generates a new string from a string, tuple, or element in the list, with the specified character (delimiter) connection
Os.path.join (): Combine multiple paths to return

First, function description
1. Join () function

Syntax: ' Sep '. Join (SEQ)

Parameter description
Sep: Delimiter. Can be empty
SEQ: sequence of elements to concatenate, strings, tuples, dictionaries
The syntax above is to combine all the SEQ elements into a new string with Sep as a delimiter

Return value: Returns a string that is generated after each element is concatenated with the delimiter Sep

2. Os.path.join () function

Syntax: Os.path.join (path1[,path2[,......])

Return value: Combine multiple paths to return

Note: Parameters before the first absolute path are ignored

Note: The element inside the container object must be a character type

#对序列进行操作（分别使用‘ ‘与‘:‘作为分隔符） >>> seq1 = [ ‘hello‘ , ‘good‘ , ‘boy‘ , ‘doiido‘ ] >>> print ‘ ‘ .join(seq1) hello good boy doiido >>> print ‘:‘ .join(seq1) hello:good:boy:doiido  #对字符串进行操作 >>> seq2 = "hello good boy doiido" >>> print ‘:‘ .join(seq2) h:e:l:l:o: :g:o:o:d: :b:o:y: :d:o:i:i:d:o  #对元组进行操作 >>> seq3 = ( ‘hello‘ , ‘good‘ , ‘boy‘ , ‘doiido‘ ) >>> print ‘:‘ .join(seq3) hello:good:boy:doiido  #对字典进行操作:   dict是以Key值作连接, #dict 的无序性，使元素随机连接。set 同理
>>> seq4 = { ‘hello‘ : 1 , ‘good‘ : 2 , ‘boy‘ : 3 , ‘doiido‘ : 4 } >>> print ‘:‘ .join(seq4) boy:good:doiido:hello  #合并目录 >>> import os >>> os.path.join( ‘hello‘ , ‘goodboy‘ , ‘doiido‘ ) ‘hello\goodboy\doiido‘   #windows platform auto add \ between each string
' Hello/goodboy/doiido ' #linux platform auto Add/between each string

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Function: Split ()

There are two functions for split () and Os.path.split () in Python, as follows:
Split (): Splits the string. Slices a string by specifying a delimiter and returns a segmented list of strings
Os.path.split (): Splits the file name and path by path

First, function description
1. Split () function
Syntax:str.split (str= "", Num=string.count (str)) [n]

Parameter description:
STR: is represented as a delimiter, the default is a space, but cannot be empty ('). If there is no delimiter in the string, the entire string is used as an element of the list
Num: Indicates the number of splits. If there is a parameter num, it is separated into only num+1 substrings, and each substring can be assigned to a new variable
[n]: Indicates selection of Nth Shard

Note: When spaces are used as separators, items that are empty in the middle are automatically ignored

2. Os.path.split () function
Syntax: Os.path.split (' path ')

Parameter description:

1. Path refers to the full path of a file as a parameter:
2. If a directory and filename are given, the output path and file name
3. If a directory name is given, the output path and the empty file name

>>> u = "www.doiido.com.cn"    #使用默认分隔符 >>> print u.split() [ ‘www.doiido.com.cn‘ ]    #以"."为分隔符 >>> print u.split( ‘.‘ ) [ ‘www‘ , ‘doiido‘ , ‘com‘ , ‘cn‘ ]    #分割0次 >>> print u.split( ‘.‘ , 0 ) [ ‘www.doiido.com.cn‘ ]    #分割一次 >>> print u.split( ‘.‘ , 1 ) [ ‘www‘ , ‘doiido.com.cn‘ ]    #分割两次 >>> print u.split( ‘.‘ , 2 ) [ ‘www‘ , ‘doiido‘ , ‘com.cn‘ ]    #分割两次，并取序列为1的项 >>> print u.split( ‘.‘ , 2 )[ 1 ] doiido    #分割最多次（实际与不加num参数相同） >>> print u.split( ‘.‘ , - 1 ) [ ‘www‘ , ‘doiido‘ , ‘com‘ , ‘cn‘ ]    #分割两次，并把分割后的三个部分保存到三个文件 >>> u1,u2,u3 = u.split( ‘.‘ , 2 ) >>> print u1 www >>> print u2 doiido >>> print u3 com.cn----------------------------------------------------------------------------------------Remove line break >>> c = ‘‘‘say hello baby‘‘‘    >>> print c say hello baby    >>> print c.split( ‘\n‘ ) [ ‘say‘ , ‘hello‘ , ‘baby‘ ]detach file name and path >>> import os >>> print os.path.split( ‘/dodo/soft/python/‘ ) ( ‘/dodo/soft/python‘ , ‘‘) >>> print os.path.split( ‘/dodo/soft/python‘ ) ( ‘/dodo/soft‘ , ‘python‘ )A super-good example >>> str = "hello boy<[www.doiido.com]>byebye"    >>> print str .split( "[" )[ 1 ].split( "]" )[ 0 ] www.doiido.com    >>> print str .split( "[" )[ 1 ].split( "]" )[ 0 ].split( "." ) [ ‘www‘ , ‘doiido‘ , ‘com‘ ]Import OS

def currentpath (file):
Try
filepath = Os.path.abspath (
Os.path.join (
Os.path.join (os.path.dirname (file), Os.pardir), Os.pardir, ' elements/' + ' IOS ' + ' _elements ')
Return filepath
Except exception,msg:
Print msg


Print __file__ #allen. py

S1 = Os.path.abspath (__file__)
Print S1 # C:\pythonn\allen.py

S2 = os.path.dirname (S1)
Print S2 # C:\pythonn

Print Os.pardir #..

Print Currentpath (__file__) # C:\elements\IOS_elements

Print os.path.join (' Hello ', ' good ', ' Boy ') # Hello\good\boy

The join () function in Python split () function