Python list remove()
Python List remove() is an inbuilt function in the Python programming language that removes a given object from the List.
Syntax:
list_name.remove(obj)Parameters:
- obj: object to be removed from the list
Returns:
The method does not return any value but removes the given object from the list.
Exception:
If the element doesn’t exist, it throws ValueError: list.remove(x): x not in list exception.
Note:
It removes the first occurrence of the object from the list.
Example 1: Remove element from the list
Python3
# Python3 program to demonstrate the use of# remove() method# the first occurrence of 1 is removed from the listlist1 = [ 1, 2, 1, 1, 4, 5 ]list1.remove(1)print(list1)# removes 'a' from list2list2 = [ 'a', 'b', 'c', 'd' ]list2.remove('a')print(list2) |
Output
[2, 1, 1, 4, 5] ['b', 'c', 'd']
Example 2: Deleting element that doesn’t exist
Python3
# Python3 program for the error in# remove() method# removes 'e' from list2list2 = [ 'a', 'b', 'c', 'd' ]list2.remove('e')print(list2) |
Output:
Traceback (most recent call last):
File "/home/e35b642d8d5c06d24e9b31c7e7b9a7fa.py", line 8, in
list2.remove('e')
ValueError: list.remove(x): x not in listExample 3: Using remove() Method On a List having Duplicate Elements
Python3
# My Listlist2 = [ 'a', 'b', 'c', 'd', 'd', 'e', 'd' ]# removing 'd'list2.remove('d')print(list2) |
Output
['a', 'b', 'c', 'd', 'e', 'd']
Note: If a list contains duplicate elements, it removes the first occurrence of the object from the list.
Example 4: Given a list, remove all the 1’s from the list and print the list
Python3
# Python3 program for practical application# of removing 1 until all 1 are removed from the list list1 = [1, 2, 3, 4, 1, 1, 1, 4, 5]# looping till all 1's are removedwhile (list1.count(1)): list1.remove(1) print(list1) |
Output
[2, 3, 4, 4, 5]
Example 5: Given a list, remove all the 2’s from the list using in keyword
Python3
# Python3 program for practical application# of removing 2 until all 2 are removed from the listmylist = [1, 2, 3, 2, 2]# looping till all 2's are removedwhile 2 in mylist: mylist.remove(2)print(mylist) |
Output
[1, 3]
Complexity Class:
- Average case : O(N)
- Amortised Worst case : O(N)
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