Python Dictionary MCQs with answers Page - 1

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A

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Q. Which method is used to return a view object of dictionary values?

  • (A) get()
  • (B) values()
  • (C) items()
  • (D) keys()

A

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Q. What happens when two keys in a dictionary are the same?

  • (A) An error occurs
  • (B) The first key is retained
  • (C) The last key overwrites the previous one
  • (D) Both keys are stored

A

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Q. What will `dict.fromkeys(['a', 'b'], 0)` return?

  • (A) {'a': 0, 'b': 0}
  • (B) {'a': None, 'b': None}
  • (C) {0: 'a', 0: 'b'}
  • (D) ['a', 'b']: 0

A

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Q. Which keyword is used to check if a key exists in a dictionary?

  • (A) exists
  • (B) has
  • (C) in
  • (D) contains

A

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Q. What does `dict.setdefault('key', default)` do?

  • (A) Sets a new key only if it exists
  • (B) Returns the value if key exists; otherwise sets it to default
  • (C) Raises an error if key doesn’t exist
  • (D) Deletes the key

A

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Q. Can a dictionary have a key of any data type?

  • (A) Yes, any data type
  • (B) Only strings
  • (C) Only integers and strings
  • (D) Only immutable types like strings, numbers, tuples

A

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Q. Which method returns the value for the given key, or None if not found?

  • (A) get()
  • (B) find()
  • (C) lookup()
  • (D) select()

A

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Q. What does `popitem()` do in a dictionary?

  • (A) Removes all items
  • (B) Removes an arbitrary key-value pair
  • (C) Removes the first item
  • (D) Removes the last inserted key-value pair

A

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Q. What is the time complexity of accessing a value from a dictionary?

  • (A) O(n)
  • (B) O(log n)
  • (C) O(1)
  • (D) O(n log n)

A

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Q. Which is a correct way to merge two dictionaries `d1` and `d2` in Python 3.9+?

  • (A) d1 = d1 + d2
  • (B) d1.merge(d2)
  • (C) d1 |= d2
  • (D) merge(d1, d2)

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