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Python Set pop() Method Example

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Python set pop() is an inbuilt method that removes a random element from the set when it is called. This means it does not pop from the back or front, and it can pop any element from anywhere present in the set. The pop() method removes any item anywhere from the set.

Python Set pop() Method

The set pop() method removes the random item from the set and returns the removed item. Unlike the stack, a random element is popped off the set. This is one of the essential functions of the set and accepts no arguments. The return value is the popped element from the set.

Syntax

set.pop()

Here, the set is the name of the set, and the pop() method does not take any argument as a parameter.

Return Value

The set pop() method returns the value which is popped. The value is popped randomly.

If the set is empty, it returns a TypeError exception.

See the following code example.

# app.py

# Declaring sets
# Set of name
name = {'Debasis', 'Shubh', 'Shouvik', 'Rohit', 'Debanjan'}
# Set of roll numbers
roll = {24, 25, 27, 36, 40}

# printing the sets
print("Before popping name set is: ", name)
print("Before popping roll set is: ", roll)

# Now we will pop value from both the sets
print("Name which is popped: ", name.pop())
print("Roll which is popped: ", roll.pop())

# Printing the updated sets
print("Updated name set is: ", name)
print("Updated roll set is: ", roll)

print("Name which is popped: ", name.pop())
print("Roll which is popped: ", roll.pop())

# Printing the updated sets
print("Updated name set is: ", name)
print("Updated roll set is: ", roll)

Output

Before popping name set is:  {'Rohit', 'Shouvik', 'Debanjan', 'Debasis', 'Shubh'}
Before popping roll set is:  {36, 40, 24, 25, 27}
Name which is popped:  Rohit
Roll which is popped:  36
Updated name set is:  {'Shouvik', 'Debanjan', 'Debasis', 'Shubh'}
Updated roll set is:  {40, 24, 25, 27}
Name which is popped:  Shouvik
Roll which is popped:  40
Updated name set is:  {'Debanjan', 'Debasis', 'Shubh'}
Updated roll set is:  {24, 25, 27}

We can see here that, when we are printing the set, values are showing according to the given input data. They are showing randomly.

Similarly, when we are popping the value, it is popping value randomly. We have popped values twice and printed each time the updated sets. 

Though in my PC, it is popping values from the front, in your case, it might be different, and each time you will run this program, you will get different answers. So please don’t be confused if your answer is different.

Operate pop() method on empty set

Let’s operate method the empty set.

# app.py

# Declaring empty set
# Set of name
name = {}


# Now we will pop value from both the sets
print("Name which is popped: ", name.pop())

Output

python3 app.py
Traceback (most recent call last):
  File "app.py", line 7, in <module>
    print("Name which is popped: ", name.pop())
TypeError: pop expected at least 1 arguments, got 0

Operate pop() on Python mixed set

Let’s declare a mixed set and use the set pop method to remove a random item from a set.

# app.py

mixed_set = {'Stranger Things', 11, 'Rick and Morty',
             21, 'The Witcher', 46, 'Education'}
print('The Original Set : ', mixed_set)

x = mixed_set.pop()
print('\npop Item         : ', x)
print('The Set after pop: ', mixed_set)

y = mixed_set.pop()
print('\npop Item         : ', y)
print('The Set after pop: ', mixed_set)

Output

python3 app.py
The Original Set :  {'Education', 'Stranger Things', 11, 'The Witcher', 46, 'Rick and Morty', 21}

pop Item         :  Education
The Set after pop:  {'Stranger Things', 11, 'The Witcher', 46, 'Rick and Morty', 21}

pop Item         :  Stranger Things
The Set after pop:  {11, 'The Witcher', 46, 'Rick and Morty', 21}

Finally, Python Set pop() Method Example is over.

See also

Python set issuperset()

Python set issubset()

Python set isdisjoint()

Python set intersection_update()

Python set intersection()

Python set discard()

Python set difference_update()

Python set difference()

Python set copy()

Python set clear()

Python set add()

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