The Python split of function splits strings and converts strings into columns

Function: split ()

There are two functions in Python, split () and os. path. split (), which work as follows:

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

os. path. split (): Separate file name and path by path

1. Function description

1. split () Function

Syntax: str. split (str= "", num=string. count (str)) [n]

Parameter description:

str: Represents as a delimiter, defaults to spaces, but cannot be empty (''). If there is no delimiter in the string, the whole string is regarded as 1 element of the list

num: Indicates the number of splits. If the parameter num exists, it is only separated into num+1 substrings, and every 1 substring can be assigned to a new variable

[n]: Selects the n fragment

Note: When a space is used as a delimiter, items with empty middle are automatically ignored

2. os. path. split () Function

Syntax: os. path. split ('PATH')

Parameter description:

PATH refers to the full path of 1 file as a parameter:

If 1 directory and file name are given, the path and file name are output

If 1 directory name is given, the output path and empty file name

2. Examples

1. Common examples

>>> u = "www.doiido.com.cn"
 
# Use the default separator 
>>> print u.split()
['www.doiido.com.cn']
 
# With "." Is a separator 
>>> print u.split('.')
['www', 'doiido', 'com', 'cn']
 
# Segmentation 0 Times 
>>> print u.split('.',0)
['www.doiido.com.cn']
 
# Segmentation 1 Times 
>>> print u.split('.',1)
['www', 'doiido.com.cn']
 
# Split twice 
>>> print u.split('.',2)
['www', 'doiido', 'com.cn']
 
# Divide twice and take the sequence as 1 Items of 
>>> print u.split('.',2)[1]
doiido
 
# Maximum number of splits (actual and non-added num Same parameters) 
>>> print u.split('.',-1)
['www', 'doiido', 'com', 'cn']
 
# Split twice, and put the split 3 Parts are saved to 3 Files 
>>> u1,u2,u3 = u.split('.',2)
>>> print u1
www
>>> print u2
doiido
>>> print u3
com.cn

2. Remove the line break

>>> c = '''say
hello
baby'''
 
>>> print c
say
hello
baby
 
>>> print c.split('\n')
['say', 'hello', 'baby']

3. Separate 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')

4, 1 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']