Question

If a={5,6,7}, what happens when a.add(5) is executed?

(a) a={5,5,6,7}

(b) a={5,6,7}

(c) Error as there is no add function for set data type

(d) Error as 5 already exists in the set

I had been asked this question in an online interview.

My question is taken from Sets topic in division Tuples and Sets of Python

Answer 1

Correct option is (b) a={5,6,7}

For explanation: There exists add method for set data type. However 5 isn’t added again as set consists of only non-duplicate elements and 5 already exists in the set. Execute in python shell to verify.