Python3 List sort() Method
Python3 ListsDescription
The sort() function is used to sort the original list. If a parameter is specified, the specified comparison function is used.
Syntax
Syntax of the sort() method:
list.sort( key=None, reverse=False)
Parameters
Parameters
- key -- Mainly used to compare elements. It has only one parameter, and the parameter of the specific function is taken from the iterable object, specifying an element in the iterable object for sorting.
- reverse -- Sorting rule,reverse = Truedescending,reverse = Falseascending (default).
Return Value
This method does not return a value, but it sorts the objects of the list.
Example
The following example demonstrates how to use the sort() function:
Example
#!/usr/bin/python
aList = ['Google', 'Example', 'Taobao', 'Facebook']
aList.sort()
print ( "List : ", aList)
The output of the above example is as follows:
List : ['Facebook', 'Google', 'Example', 'Taobao']
The following example outputs the list in descending order:
Example
#!/usr/bin/python
# -*- coding: UTF-8 -*-
# List
vowels = ['e', 'a', 'u', 'o', 'i']
# Descending
vowels.sort(reverse=True)
# Output result
print ( 'Descending output:', vowels )
The output of the above example is as follows:
降序输出: ['u', 'o', 'i', 'e', 'a']
The following example demonstrates how to output a list by specifying the sorting of elements in the list:
Example
#!/usr/bin/python
# Get the second element of the list
def takeSecond(elem):
return elem[1]
# List
random = [(2, 2), (3, 4), (4, 1), (1, 3)]
# Sort by the second element
random.sort(key=takeSecond)
# Output category
print ('Sorted list:', random)
The output of the above example is as follows:
排序列表：[(4, 1), (2, 2), (1, 3), (3, 4)]Other Extensions