Python

pop() method in list

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pop() method in list - Python

The .pop() method is used to pop an element from a list by index position.

This method takes at most one argument i.e. index value of the element that you want to pop from the list if you do not give any index position then it will pop the last element from the list by default.

The .pop() method returns a popped element that you can use further in your code.

It will raise an error when you apply the .pop() method on an empty list and when you pass the index outside the list range.

You can also use negative indexing in this method.

The time complexity of this method is O(1).

Syntax –

list.pop(index)

Parameter –

index → index position of an element that you want to remove, it is optional.

return → returns popped element.

Example 1- Remove the last element from the list

				
					my_list=[2,4,6,8,10]
print("Original list:",my_list)
my_list.pop()
print("Modified original list:",my_list)

# Output -
# Original list: [2, 4, 6, 8, 10]
# Modified original list: [2, 4, 6, 8]

In the above example, first we create a list with some elements and store it in my_list variable.

After creating the list print the original list on the output screen.

Then pop the last element from the list using the .pop() method.

Finally, print the modified original list on the output screen.

Example 2- pop an element from a list by a specific index position

				
					my_list=['hello', 'python', 'method', 'pop']
print("Original list:",my_list)
my_list.pop(2)
print("Modified Original list:",my_list)

# Output -
# Original list: ['hello', 'python', 'method', 'pop']
# Modified Original list: ['hello', 'python', 'pop']

Example 3- pop an element from a list by using negative indexing

				
					It_city=['Bangalore','Noida', 'Pune', 'Gwalior', 'Hyderabad']
print("Original list:",It_city)
It_city.pop(-2)
print("Modified Original list:",It_city)

# Output -
# Original list: ['Bangalore', 'Noida', 'Pune', 'Gwalior', 'Hyderabad']
# Modified Original list: ['Bangalore', 'Noida', 'Pune', 'Hyderabad']

Example 4- sorting a list using the.pop() method

				
					l=[11,14,2,15,9,5,7]
print("Original unsorted list:",l)
l1=[]
for i in range(len(l)):
    index=l.index(min(l))
    popped_element=l.pop(index)
    l1.append(popped_element)
print("Sorted original list:",l1)

# Output -
# Original unsorted list: [11,14,2,15,9,5,7]
# Sorted original list: [2, 5, 7, 9, 11, 14, 15]

Example 5- Let’s try to remove an element by giving an index out of range

				
					subject=['Data Mining', 'Software Architecture', 'Big Data']
print("Original Subject list:",subject)
subject.pop(3)                          # will throw an error because index range(0,2)
print("Modified subject list:",subject)

# Output -
# Original Subject list: ['Data Mining', 'Software Architecture', 'Big Data']
# Traceback (most recent call last):
 # File "/home/main.py", line 3, in <module>
   # subject.pop(3)
# IndexError: pop index out of range

Difference between the pop and remove methods in list Python?

remove()	pop()
It removes the element from a list by value	It is used to remove the element by the index of the element
This method doesn’t return anything	This method returns the popped element
When you do not pass any value to this method it will give an error `ValueError`.	When you do not pass any value then it will remove the last element by default
It will give an error when the passed element doesn’t exist in the list	It will give an error when the passed index is out of range.

Python

pop() method in list

pop() method in list - Python

Difference between the pop and remove methods in list Python?

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