In Python, a Set is a collection data type that is unordered and mutable. A set cannot have duplicate elements. Here, the task is to find out the number of elements present in a set. See the below examples.
Examples:
Input: a = {1, 2, 3, 4, 5, 6}
Output: 6
Input: a = {'Geeks', 'For'}
Output: 2
The idea is use len() in Python
Example 1:
Python3
# Python program to find the length# of set  set1 = set()      # Adding element and tuple to the Set set1.add(8) set1.add(9) set1.add((6, 7))   print("The length of set is:", len(set1)) |
Output:
The length of set is: 3
Example 2:
Python3
n = len({1, 2, 3, 4, 5})Â Â print("The length of set is:", n) |
Output:
The length of set is: 5
How does len() work?len() works in O(1) time as the set is an object and has a member to store its size. Below is description of len() from Python docs.
Return the length (the number of items) of an object. The argument may be a sequence (such as a string, bytes, tuple, list, or range) or a collection (such as a dictionary, set, or frozen set).
