Question

How to check if an element is in a set in Python?

Answer 1

You can check if an element is present in a set in Python using the in keyword. The in keyword returns True if the element is present in the set, and False otherwise. 

Here's an example:

my_set = {1, 2, 3, 4, 5}
if 3 in my_set:
    print("3 is present in the set")
else:
    print("3 is not present in the set")
 

Output:

3 is present in the set
 

You can also use the not in keyword to check if an element is not present in the set. 

Here's an example:

my_set = {1, 2, 3, 4, 5}
if 6 not in my_set:
    print("6 is not present in the set")
else:
    print("6 is present in the set")
 

Output:

6 is not present in the set
 

Note that the in and not in keywords work with all types of sets, including sets of strings, sets of tuples, etc.