Check if Set Contains Element in Python

To check if a set contains a specific element in Python, you can use the Python in operator.

set_of_numbers = {0,1,2,3,4}

if 3 in set_of_numbers:
    print("3 is in the set of numbers!")
else:
    print("3 is not in the set of numbers!")

#Output:
3 is in the set of numbers

If you want to check if an element is not in a set, you can use the Python not in operator.

set_of_numbers = {0,1,2,3,4}

if 5 not in set_of_numbers:
    print("5 is not in the set of numbers!")
else:
    print("5 is in the set of numbers!")

#Output:
5 is not in the set of numbers

In Python, sets are unordered collections of items. When working with sets, it can be useful to know if certain elements are contained in a set.

We can easily check if a set contains an element in Python.

To check if a set contains an element, we can use the Python in operator. The in operator checks if an element is in a set and returns a boolean value.

Below is a simple example of how to use the in operator in Python to check if an element is in a set.

set_of_numbers = {0,1,2,3,4}

print(3 in set_of_numbers)
print(5 in set_of_numbers)

#Output:
True
False

How to Check if a Set Contains an Element with not in in Python

We can also go the other way and check if a set doesn’t contain an element. To check if a set doesn’t contain an element in Python, we use the Python not in operator.

Below are a few examples of how to use not in to check if a set doesn’t contain a particular element in Python.

set_of_numbers = {0,1,2,3,4}

print(3 not in set_of_numbers)
print(5 not in set_of_numbers)

#Output:
False
True

Hopefully this article has been useful for you to learn how to check if a set contains an element in Python.