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Delete items from Sorted list

February 4, 2021

Deleting items from a Sorted list:

We can delete items from sorted listed in Python using the following methods

  • Pop-  delete items based on index of elements
  • Remove- removes the particular item 
  • Del- deletes group of elements
  • Clear- clears an entire list 

We can use any of these according to the application. Let’s see how each function works for a sorted list and lastly, we will see a  method to delete an item manually.

Delete item from sorted list in Python

Pop:

  • Pop deletes based on index of the items. If index not given then it take last index of list in default . We can store the deleted item into another variable.

Code#1:

#rishikesh 
#delete item in a sorted list
#python Program

#python Program

ar=[1,4,2,5]

#sorting the array

ar.sort()

print(‘Popped element:’,ar.pop())

print(‘After popping element list-‘ , ar)


Output : 

Popped element: 5
After popping element list- [1, 2, 4]
  • Pop operation Takes O(1) time, to delete the element from the list but it deletes the last element from the list.

Remove :

  • Remove deletes the item that is passed as argument for remove function. It removes first occurrence of that item.

Code #2

#rishikesh 
#delete item in a sorted list
#python Program
ar=[1,4,2,5]
ar.remove(4)
print(‘After Removing a element from list-‘ , ar)

Output :

After Removing a element from list- [1, 2, 5]
  • Remove Takes O(n) time to delete a item from the list.

Clear :

  • Clear is used to delete entire list at same time. 

Del :

  • Del() function deletes group of elements of list at once by using slicing. del(x[:]) this will delete entire list  

We can delete a item from list manually .

Code #3:

#prepInsta
#rishikesh 
#delete item in a sorted list
#python Program

x=[1,2,3,56,3,3,22]

x.sort()

del(x[1:3])

print(“List after deleting group of elements: “,x)
#deleting manually 56 

a=22

for i in range(len(x)):

    if(x[i]<a):

        pass 

    elif(x[i]==a):

        pass 

    elif(x[i]>a):

        x[i-1]=x[i]
x.pop()

print(‘After deleting a element :’,x) 
#deleting the whole list 

x.clear()

print(‘After clear function:’,x)

Output :

List after deleting group of elements: [1, 3, 3, 22, 56]
After deleting a element : [1, 3, 3, 56]
After clear function: []
  • These are the various method to delete items from sorted list in python.