Remove element from a Python LIST [clear, pop, remove, del]

Python List data-type helps you to store items of different data types in an ordered sequence. The data is written inside square brackets ([]), and the values are separated by comma(,).

In Python, there are many methods available on the list data type that help you remove an element from a given list. The methods are remove(), pop() and clear() .

Besides the list methods, you can also use a del keyword to remove items from a list.

Example of list

my_list = ['Guru', 50, 11.50, 'Siya', 50, ['A', 'B', 'C']]

The index starts from 0. In the list: my_list at

0^th index we have the string ‘Guru’,

• At index: 1 you will get the number 50 which is a integer.
• At index:2 you will get the floating number 11.50
• At index:3, there is a string ‘Siya.’
• At index:4, you will see the number 50 is duplicated.
• At index:5, you will get a list with values A, B, and C.

Python remove() method

Python removes () method is a built-in method available with the list. It helps to remove the given very first element matching from the list.
Syntax:

list.remove(element)

The element that you want to remove from the list.

ReturnValue

There is no return value for this method.

Tips for using remove() method:

Following are the important points to remember when using remove () method:

• When the list has duplicate elements, the very first element that matches the given element will be removed from the list.
• If the given element is not present in the list, it will throw an error saying the element is not in the list.
• The remove () method does not return any value.
• The remove () takes the value as an argument, so the value has to pass with the correct datatype.

Example: Using remove() method to remove an element from the list

Here is a sample list that i have

my_list = [12, 'Siya', 'Tiya', 14, 'Riya', 12, 'Riya'] 

The list has elements of date-types string and number. The list has duplicate elements like number 12 and string Riya.

my_list = [12, 'Siya', 'Tiya', 14, 'Riya', 12, 'Riya']
my_list.remove(12) # it will remove the element 12 at the start.
print(my_list)
my_list.remove('Riya') # will remove the first Riya from the list
print(my_list)
my_list.remove(100)  #will throw an error
print(my_list)

Output::

['Siya', 'Tiya', 14, 'Riya', 12, 'Riya']
['Siya', 'Tiya', 14, 12, 'Riya']
Traceback (most recent calllast):
File "display.py", line 9, in <module>
    my_list.remove(100)
ValueError: list.remove(x): x not in the list

Python pop() method

The pop() method removes an element from the list based on the index given.
Syntax

list.pop(index)

index: the pop() method has only one argument called index.

• To remove an element from the list, you need to pass the index of the element. The index starts at 0. To get the first element from the list pass index as 0. To remove the last element, you can pass the indexas -1.
• The index argument is optional. If not passed, the default value is considered -1, and the last element from the list is returned.
• If the index given is not present, or out of range, the pop() method throws an error saying IndexError: pop index.

ReturnValue:

The pop() method will return the element removed based on the index given. The final list is also updated and will not have the element.

Example: Using the pop() method to remove an element from the list

The list will use in the example is my_list = [12, ‘Siya’, ‘Tiya’, 14, ‘Riya’, 12, ‘Riya’] .

Let us try to remove element using a pop() method based on the following :

• By giving index
• Without index
• Passing index that is out of range.

Here, we are removing Tiya from the list. The index starts from 0 , so the index for Tiya is 2.

my_list = [12, 'Siya', 'Tiya', 14, 'Riya', 12, 'Riya']

#By passing index as 2 to remove Tiya
name = my_list.pop(2)
print(name)
print(my_list)

#pop() method without index – returns the last element
item = my_list.pop()
print(item)
print(my_list)

#passing index out of range
item = my_list.pop(15)
print(item)
print(my_list)

Output::

Tiya
[12, 'Siya', 14, 'Riya', 12, 'Riya']
Riya
[12, 'Siya', 14, 'Riya', 12]
Traceback (most recent calllast):
File "display.py", line 14, in <module>
item = my_list.pop(15)
IndexError: popindex out of range

Python clear() method

The clear() method will remove all the elements present in the list.
Syntax:

list.clear()

Parameters:

No parameters.

ReturnValue:

Ther is no return value. The list() is emptied using clear() method.

Example: Using clear() method to remove all elements from the list

The clear() method will empty the given list. Let us see the working of clear() in the example below:

my_list = [12, 'Siya', 'Tiya', 14, 'Riya', 12, 'Riya']

#Using clear() method
element = my_list.clear()
print(element)
print(my_list)

Output::

None
[]

Using del keyword

To remove an element from the list, you can use the del keyword followed by a list. You have to pass the index of the element to the list. The index starts at 0.
Syntax:

del list[index]

You can also slice a range of elements from the list using the del keyword. The start/stop index from the list can be given to del keyword, and the elements falling in that range will be removed. The syntax is as follows:
Syntax:

del list[start:stop]

Here is an example that shows to remove the first element, last element, multiple elements from the list using del.

my_list = list(range(15))
print("The Original list is ", my_list)

#To remove the firstelement
del my_list[0]
print("After removing first element", my_list)

#To remove last element
del my_list[-1]
print("After removing last element", my_list)

#To remove element for given index : for example index:5
del my_list[5]
print("After removing element from index:5", my_list)

#To remove last 2 elements from the list
del my_list[-2]
print("After removing last 2 elements", my_list)

#To remove multiple elements
delmy_list[1:5]
print("After removing multiple elements from start:stop index (1:5)", my_list)

#To remove multiple elements
del my_list[4:]
print("To remove elements from index 4 till the end (4:)", my_list)

Output::

The Originallist is  [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]
After removing first element [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]
After removing last element [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13]
After removing element from index:5 [1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13]
After removing last 2 elements [1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 13]
After removing multiple elements from start:stop index (1:5) [1, 7, 8, 9, 10, 11, 13]
To remove elements from index 4 till the end (4:) [1, 7, 8, 9]

How do I remove the first element from a list?

You can make use of list methods like remove(), pop() to remove the first element from the list. In the case of remove() method, you will have to pass the first element to be removed and for pop the index, i.e., 0.

You may also use the del keyword to remove the first element from the list.

The example below shows to remove first element from list using remove(), pop() and del.

my_list1 = ['A', 'B', 'C', 'D', 'E', 'F']
print("The Originallist is ", my_list1)
#Using remove() to remove first element
my_list1.remove('A')
print("Using remove(), the final list is ", my_list1)

my_list1 = ['A', 'B', 'C', 'D', 'E', 'F']
print("The Originallist is ", my_list1)
#Using pop() to remove the first element
element = my_list1.pop(0)
print("The first element removed from my_list1 is ", element)
print("Using pop(), the final list is ", my_list1)

#Using del to remove the first element
my_list2 = ['A', 'B', 'C', 'D', 'E', 'F']
del my_list2[0]
print("Using del, the final list is ", my_list2)

Output::

The Originallist is  ['A', 'B', 'C', 'D', 'E', 'F']
Using remove(), the final list is  ['B', 'C', 'D', 'E', 'F']
The Originallist is  ['A', 'B', 'C', 'D', 'E', 'F']
The first element removed from my_list1 is  A
Using pop(), the final list is  ['B', 'C', 'D', 'E', 'F']
Using del, the final list is  ['B', 'C', 'D', 'E', 'F']

How do I remove multiple elements from a list in Python?

The list methods remove(), and pop() are meant to remove a single element. To remove multiple aspects, make use of the del keyword.

From the list [‘A’, ‘B’, ‘C’, ‘D’, ‘E’, ‘F’], we want to remove elements B, C and D. Below example shows the how to make use of del keyword to remove the elements.

#Using del to remove the multiple elements from list
my_list2 = ['A', 'B', 'C', 'D', 'E', 'F']
print("Originallist is ", my_list2)
del my_list2[1:4]
print("Using del, the final list is ", my_list2)

Output::

Originallist is  ['A', 'B', 'C', 'D', 'E', 'F']
Using del, the final list is  ['A', 'E', 'F']

How do I remove an element from a list by using index in Python?

To remove element based on index, you can make use of list method pop() . Even using del keyword will help you to remove the element for a given index.

#Using del to remove the multiple elements from list
my_list1 = ['A', 'B', 'C', 'D', 'E', 'F']
print("Originallist is ", my_list1)
element = my_list1.pop(2)
print("Element removed for index: 2 is ", element)
print("Using pop, the final list is ", my_list1)


#Using del to remove the multiple elements from list
my_list2 = ['A', 'B', 'C', 'D', 'E', 'F']
print("Originallist is ", my_list2)
del my_list2[2]
print("Using del, the final list is ", my_list2)

Output:

Originallist is  ['A', 'B', 'C', 'D', 'E', 'F']
Element removed for index: 2 is  C
Using pop, the final list is  ['A', 'B', 'D', 'E', 'F']
Originallist is  ['A', 'B', 'C', 'D', 'E', 'F']
Using del, the final list is  ['A', 'B', 'D', 'E', 'F']

Summary

In Python, there are many methods available on the list data type that helps you to remove an element from a given list. The methods are remove(), pop() and clear().

Important built-in methods available on list to remove elements

Method	Description
remove()	It helps to remove the very first given element matching from the list.
pop()	The pop() method removes an element from the list based on the index given.
clear()	The clear() method will remove all the elements present in the list.

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