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Different ways to clear a list in Python
  • Difficulty Level : Basic
  • Last Updated : 17 Oct, 2019

There are many ways of clearing the list through methods of different constructs offered by Python language. Let’s try to understand each of the method one by one.

  • Method #1 : Using clear() method




    # Python program to clear a list
    # using clear() method 
      
    # Creating list
    GEEK = [6, 0, 4, 1]
    print('GEEK before clear:', GEEK) 
      
    # Clearing list 
    GEEK.clear() 
    print('GEEK after clear:', GEEK) 

    Output:

    GEEK before clear: [6, 0, 4, 1]
    GEEK after clear: []
    

     

  • Method #2 : Reinitializing the list : The initialization of the list in that scope, initializes the list with no value. i.e list of size 0. Let’s see the example demonstrating Method 1 and 2 to clear list




    # Python3 code to demonstrate 
    # clearing a list using
    # clear and Reinitializing 
      
    # Initializing lists
    list1 = [1, 2, 3]
    list2 = [5, 6, 7]
      
    # Printing list1 before deleting 
    print ("List1 before deleting is : " 
    +  str(list1))
      
    # deleting list using clear()
    list1.clear()
      
    # Printing list1 after clearing
    print ("List1 after clearing using clear() : " 
    + str(list1))
      
    # Printing list2 before deleting 
    print ("List2 before deleting is : "
     +  str(list2))
      
    # deleting list using reinitialization
    list2 = []
      
    # Printing list2 after reinitialization
    print ("List2 after clearing using reinitialization : " 
    + str(list2))

    Output:

    List1 before deleting is : [1, 2, 3]
    List1 after clearing using clear() : []
    List2 before deleting is : [5, 6, 7]
    List2 after clearing using reinitialization : []
    

     

  • Method #3 : Using “*= 0” : This is a lesser known method, but this method removes all elements of the list and makes it empty.




    # Python3 code to demonstrate 
    # clearing a list using
    # *= 0 method
      
    # Initializing lists
    list1 = [1, 2, 3]
      
    # Printing list1 before deleting 
    print ("List1 before deleting is : " + str(list1))
      
    # deleting list using *= 0
    list1 *= 0
      
    # Printing list1 after *= 0
    print ("List1 after clearing using *= 0: " + str(list1))

    Output:

    List1 before deleting is : [1, 2, 3]
    List1 after clearing using *= 0: []

     

  • Method #4 : Using del : del can be used to clear the list elements in a range, if we don’t give a range, all the elements are deleted.




    # Python3 code to demonstrate 
    # clearing a list using
    # del method
      
    # Initializing lists
    list1 = [1, 2, 3]
    list2 = [5, 6, 7]
      
    # Printing list1 before deleting 
    print ("List1 before deleting is : " + str(list1))
      
    # deleting list1 using del
    del list1[:]
    print ("List1 after clearing using del : " + str(list1))
      
      
    # Printing list2 before deleting 
    print ("List2 before deleting is : " + str(list2))
      
    # deleting list using del
    del list2[:]
    print ("List2 after clearing using del : " + str(list2))

    Output:

    List1 before deleting is : [1, 2, 3]
    List1 after clearing using del : []
    List2 before deleting is : [5, 6, 7]
    List2 after clearing using del : []
    

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