# Output of Python Programs | Set 24 (Sets)

Prerequisite: Python-Sets

1. What is the output of the code shown below?

 sets = {1, 2, 3, 4, 4} print(sets)

Options:

1. {1, 2, 3}
2. {1, 2, 3, 4}
3. {1, 2, 3, 4, 4}
4. Error
Output:
2. {1, 2, 3, 4}

Explanation : Duplicate values are not allowed in sets. Hence, the output of the code shown above will be a set containing the duplicate value only once. Hence output will be {1, 2, 3, 4}.

2. What is the output of the code shown below?

 sets = {3, 4, 5} sets.update([1, 2, 3]) print(sets)

Options:

1. {1, 2, 3, 4, 5}
2. {3, 4, 5, 1, 2, 3}
3. {1, 2, 3, 3, 4, 5}
4. Error
Output:
1. {1, 2, 3, 4, 5}

Explanation: The method update adds elements to a set.

3. What is the output of the code shown below?

 set1 = {1, 2, 3} set2 = set1.copy() set2.add(4) print(set1)

Options:

1. {1, 2, 3, 4}
2. {1, 2, 3}
3. Invalid Syntax
4. Error
Output:
2. {1, 2, 3}

Explanation: In the above piece of code, set2 is barely a copy and not an alias of set1. Hence any change made in set2 isn’t reflected in set1.

4. What is the output of the code shown below?

 set1 = {1, 2, 3} set2 = set1.add(4) print(set2)

Options:

1. {1, 2, 3, 4}
2. {1, 2, 3}
3. Invalid Syntax
4. None
Output:
4. None

Explanation: add method doesn’t return anything. Hence there will be no output.

5. What is the output of the code shown below?

 set1 = {1, 2, 3} set2 = {4, 5, 6} print(len(set1 + set2))

Options:

1. 3
2. 6
3. Unexpected
4. Error
Output:
4. Error

Explanation: unsupported operand type(s) for +: ‘set’ and ‘set’.

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