Python list | pop()

pop() is an inbuilt function in Python that removes and returns last value from the list or the given index value.

Syntax :

list_name.pop(index)

Parameter :

index (optional) - The value at index is 
popped out and removed.

If index is not given, then last
element is popped out and removed.

Returns :

The last value or the given index value from the list

Exception :



When index is out of range, it returns IndexError

 
Code #1 :

# Python3 program for pop() method

list1 = [ 1, 2, 3, 4, 5, 6 ]

# Pops and removes the last element from the list
print(list1.pop())

# Print list after removing last element
print("New List after pop : ", list1, "\n")

list2 = [1, 2, 3, ('cat', 'bat'), 4]

# Pop last three element
print(list2.pop())
print(list2.pop())
print(list2.pop())

# Print list
print("New List after pop : ", list2, "\n")

Output :

6
New List after pop :  [1, 2, 3, 4, 5] 

4
('cat', 'bat')
3
New List after pop :  [1, 2] 

 
Code #2 :

# Python3 program showing pop() method
# and remaining list after each pop

list1 = [ 1, 2, 3, 4, 5, 6 ]

# Pops and removes the last 
# element from the list
print(list1.pop(), list1)

# Pops and removes the 0th index
# element from the list
print(list1.pop(0), list1)

Output :

6 [1, 2, 3, 4, 5]
1 [2, 3, 4, 5]

 
Code #3 : IndexError

# Python3 program for error in pop() method

list1 = [ 1, 2, 3, 4, 5, 6 ]
print(list1.pop(8))


Output :

Traceback (most recent call last):
  File "/home/1875538d94d5aecde6edea47b57a2212.py", line 5, in 
    print(list1.pop(8))
IndexError: pop index out of range

 
Practical Example :
A list fruit contains fruit_name and property saying its fruit. Another list consume has two items juice and eat. With the help of pop() and append() we can do something interesting.

# Python3 program demonstrating
# practicle use of list pop()

fruit = [['Orange','Fruit'],['Banana','Fruit'], ['Mango', 'Fruit']]
consume = ['Juice', 'Eat']
possible = []

# Iterating item in list fruit
for item in fruit :
    
    # Inerating use in list consume
    for use in consume :
        
        item.append(use)
        result.append(item[:])
        item.pop(-1)
print(result)



Output :

[['Orange', 'Fruit', 'Juice'], ['Orange', 'Fruit', 'Eat'],
 ['Banana', 'Fruit', 'Juice'], ['Banana', 'Fruit', 'Eat'],
 ['Mango', 'Fruit', 'Juice'], ['Mango', 'Fruit', 'Eat']]



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