Delete Items from Sorted List

September 26, 2023

Deleting Items from a Sorted List:

The clear(), pop(), and remove() functions in Python can be used to eliminate entries from a list. The del statement also allows you to delete things by specifying a position or range with an index or slice.

Delete item from sorted list in Python

Delete Items from 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.

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:

Run

#delete item in a sorted list
#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:

Run 
#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:

Run 
#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):
        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.

Lists in Python

Deleting items from the list

Nested List in Python

Python String join() method

Python String split() Method

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