Python Dictionary MCQs with answers Page - 5

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Q. What is the output of: `d = {'x': 100, 'y': 200}; d['z'] = d.get('z', 300)`?

  • (A) {'x': 100, 'y': 200}
  • (B) {'x': 100, 'y': 200, 'z': 300}
  • (C) Error
  • (D) {'z': 300}

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Q. What will be the output of `len({1: 'a', 2: 'b', 3: 'c', 2: 'd'})`?

  • (A) 4
  • (B) 3
  • (C) 2
  • (D) Error

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Q. What does `reversed(dict)` return?

  • (A) Reversed dictionary
  • (B) Reversed key-value pairs
  • (C) Reversed keys iterator
  • (D) Error

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Q. Which is the most memory-efficient way to create a dictionary?

  • (A) dict = {}
  • (B) dict = dict()
  • (C) dict = dict.fromkeys([])
  • (D) dict = collections.defaultdict()

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Q. What will `all({'a': 0, 'b': 1})` return?

  • (A) True
  • (B) False
  • (C) 0
  • (D) Error

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Q. What does `any({'': 1, 'b': 0})` return?

  • (A) True
  • (B) False
  • (C) Error
  • (D) None

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Q. What is the result of `{1: 'a', 1.0: 'b'}`?

  • (A) {1: 'a', 1.0: 'b'}
  • (B) {1: 'b'}
  • (C) Error
  • (D) {1.0: 'b'}

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Q. Which method creates a shallow copy of a dictionary?

  • (A) clone()
  • (B) copy()
  • (C) duplicate()
  • (D) replicate()

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Q. What does the expression `'key' not in my_dict` evaluate?

  • (A) True if 'key' exists
  • (B) False if 'key' exists
  • (C) True if 'key' does not exist
  • (D) Syntax Error

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Q. Which of the following is **not** valid syntax?

  • (A) {'a': 1, 'b': 2}
  • (B) dict(a=1, b=2)
  • (C) {[1, 2]: 'value'}
  • (D) dict([(1, 'a'), (2, 'b')])

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