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How to clear a list in Python? 4 ways to clear a list (code example)

青灯夜游

Mar 22, 2019 pm 01:29 PM

python

There are many ways to clear the list through different construction methods provided by the Python language. The following article will introduce you to 4 methods of clearing the list in Python. I hope it will be helpful to you.

How to clear a list in Python? 4 ways to clear a list (code example)

Method 1: Reinitialize the list

You can reinitialize the list and initialize the items in the scope When using a list, the list will be initialized without a value, allowing the list to be cleared.

Code example:

List = [5, 6, 7] 
print(&#39;List清空前：&#39;, List)  
#重新初始化列表
List = [] 
print(&#39;List清空后：&#39;, List)

Output:

How to clear a list in Python? 4 ways to clear a list (code example)

##Method 2: Use the clear() method

clear() method is used to clear the list. Basic syntax:

list.clear()

Code example:

List = [6, 0, 4, 1] 
print(&#39;List清空前：&#39;, List)  
  
#清空元素
List.clear()  
print(&#39;List清空后：&#39;, List)

Output:

How to clear a list in Python? 4 ways to clear a list (code example)

Method 3: Use "* = 0"

This is a little-known method, but This method removes all elements from the list and makes them empty.

Code example:

List = [8, 6, 16] 
print ("List清空前 : " + str(List)) 
#重新初始化列表
List *= 0
print("List清空后：" + str(List))

Output:

How to clear a list in Python? 4 ways to clear a list (code example)

##Method 4: Use del a[: ] del can be used to clear list elements in the range. If we do not give a range, all elements will be deleted to clear the list.

Code example

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(&#39;\n&#39;) 
 
print ("List2清空前 : " + str(List2)) 
#使用del删除List2
del List2[:] 
print("List2清空后：" + str(List2))

Output:

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