Output of Python Programs | Set 24 (Sets)

Prerequisite: Python-Sets

1. What is the output of the code shown below?
[sourcecode language=”Python3″]
sets = {1, 2, 3, 4, 4}
print(sets)
[/sourcecode]
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?
[sourcecode language=”Python3″]
sets = {3, 4, 5}
sets.update([1, 2, 3])
print(sets)
[/sourcecode]
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?
[sourcecode language=”Python3″]
set1 = {1, 2, 3}
set2 = set1.copy()
set2.add(4)
print(set1)
[/sourcecode]
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?
[sourcecode language=”Python3″]
set1 = {1, 2, 3}
set2 = set1.add(4)
print(set2)
[/sourcecode]
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?
[sourcecode language=”Python3″]
set1 = {1, 2, 3}
set2 = {4, 5, 6}
print(len(set1 + set2))
[/sourcecode]
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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