How to clear data in a list in python

How to clear list data in python: 1. Use the del keyword, the syntax format "del list[:]"; 2. Use the clear() method, which is used to delete all elements from the list , the syntax format is "list.clear()".

The operating environment of this tutorial: windows7 system, python3 version, DELL G3 computer

Clear the list data in python Method

1. Use the del keyword

del can be used to clear the list elements in the range. If we do not give the range, Then delete all elements to clear the list.

#!/usr/bin/python
List1 = [8, 6, 16] 
List2 = [4, 5, 7] 

print ("List1清空前 : " + str(List1)) 
#使用del删除List1
del List1[:] 
print("List1清空后：" + str(List1))  

print('\n') 
 
print ("List2清空前 : " + str(List2)) 
#使用del删除List2
del List2[:] 
print("List2清空后：" + str(List2))

Output:

List1清空前 : [8, 6, 16]
List1清空后：[]

List2清空前 : [4, 5, 7]
List2清空后：[]

2. Use the clear() method

clear() method to remove all elements from the list.

Syntax

list.clear()

Code example:

#!/usr/bin/python
List = [6, 0, 4, 1] 
print('List清空前：', List)  
  
#清空元素
List.clear()  
print('List清空后：', List)

Output:

List清空前： [6, 0, 4, 1]
List清空后： []

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