TypeError: 'set' object is not subscriptable

This error occurs when you try to access an element of a set using square brackets as if it were a list or a tuple. However, sets are unordered collections of unique elements, and therefore they do not support indexing.

For example:

my_set = {1, 2, 3}
print(my_set[0])

This will result in the error message:

TypeError: 'set' object is not subscriptable

To access the elements of a set, you can use a loop or check if a specific element is in the set using the `in` operator.