The split () function and the Os.path.split () function in Python

There are split () and Os.path.split () two functions in Python:

Split (): Split string. Slices the string by specifying a delimiter, and returns a list of the separated strings.

Os.path.split (): Splits the file name and path.

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 an empty string. If there are no delimiters in the string, the entire string is taken as an element of the list.
Num: Indicates the number of splits. If parameter num exists, it is separated into num+1 substrings only.
[n]: To select the nth fragment (count from 0)

By default, spaces are used as delimiters, and when separated, empty strings are automatically ignored, such as:

>>> s= ' Love python '

>>> S.split ()
[' Love ', ' python ']

However, if you explicitly specify that a space is a separator, empty strings are not automatically ignored, such as:

>>> S.split (")
[' Love ', ', ', ', ', ' Python ']

The default separator, except for spaces, and ' \n\t\r ', is separated, and the empty string is automatically ignored as follows:

>>> s= ' love \n\t\r \t\r\n python \n\t\r '
>>> S.split ()
[' Love ', ' python ']

>>> s= ' www.pku.edu.cn '
>>> s.split () #默认空格作为分隔符, but there are no delimiters in the string, so take the entire string as an element of the list
[' www.pku.edu.cn ']

>>> s.split ('. ') #以 '. ' As a delimiter, there are no separate times, and how many '. ' Are separated
[' www ', ' pku ', ' edu ', ' CN ']

>>> s.split ('. ', 0) #分隔0次
[' www.pku.edu.cn ']

>>> s.split ('. ', 1) #分隔1次
[' www ', ' pku.edu.cn ']

>>> s.split ('. ', 2) #分隔2次
[' www ', ' pku ', ' edu.cn ']

>>> s.split ('. ', 2) [1] #分隔2次, items indexed as 1
' PKU '

>>> s.split ('. ', -1) #尽可能多的分隔, same as no num parameter
[' www ', ' pku ', ' edu ', ' CN ']

>>> s1,s2=s.split ('. ', 1) #分隔1次 and store the separated 2 strings in S1 and S2
>>> S1
' www '
>>> S2
' Pku.edu.cn '

>>> s= ' Love
... hello
... python '
>>> s
' Love\nhello\npython '
>>> s.split (' \ n ') #以 ' \ n ' as a separator, as many times as possible
[' Love ', ' hello ', ' python ']
>>> Print S
Love
Hello
Python

Practice the following example:

>>> s= ' Hello Python<[www.python.com]>hello python '
>>> s.split (' [') [1].split ('] ') [0]
' Www.python.com '
>>> s.split (' [') [1].split ('] ') [0].split ('. ')
[' www ', ' python ', ' com ']

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

Parameter description: path refers to the full path of a file as an argument: if the given is a directory and file name, then the output path and file name if given a directory name, then the output path and the empty file name in fact, the function's segmentation is not intelligent, it is only "PATH" in the Last '/' as a separator, After separating, treat the index as a directory (path) of 0 and treat the index 1 as a filename, such as:

>>> Import OS
>>> os.path.split (' c:/soft/python/test.py ')
(' C:/soft/python ', ' test.py ')
>>> os.path.split (' c:/soft/python/test ')
(' C:/soft/python ', ' test ')
>>> os.path.split (' c:/soft/python/')
(' C:/soft/python ', ')

Finish