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Dictionary In Python MCQs

Practice Dictionary In Python MCQs for competitive exams.

Dictionary In Python MCQs

Practice questions from this topic.

What will be the output of the following Python code snippet? numbers = {} letters = {} comb = {} numbers[1] = 56 numbers[3] = 7 letters[4] = 'B' comb['Numbers'] = numbers comb['Letters'] = letters print(comb)

  1. A. Error, dictionary in a dictionary can't exist
  2. B. Numbers': {1: 56, 3: 7}
  3. C. {'Numbers': {1: 56}, 'Letters': {4: 'B'}}
  4. D. {'Numbers': {1: 56, 3: 7}, 'Letters': {4: 'B'}}
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What will be the output of the following Python code snippet? >>> import collections >>> a=collections.Counter([2,2,3,3,3,4]) >>> b=collections.Counter([2,2,3,4,4]) >>> a|b

  1. A. Counter({3: 3, 2: 2, 4: 2})
  2. B. Counter({2: 2, 3: 1, 4: 1})
  3. C. Counter({3: 2})
  4. D. Counter({4: 1})
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What will be the output of the following Python code snippet? d = {"john":40, "peter":45}

  1. A. "john", 40, 45, and "peter"
  2. B. "john" and "peter"
  3. C. 40 and 45
  4. D. d = (40:"john", 45:"peter")
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What will be the output of the following Python code snippet? a={1:"A",2:"B",3:"C"} print(a.get(1,4))

  1. A. 1
  2. B. A
  3. C. 4
  4. D. Invalid syntax for get method
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What will be the output of the following Python code? >>> b={} >>> all(b)

  1. A. { }
  2. B. False
  3. C. True
  4. D. An exception is thrown
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What will be the output of the following Python code? >>> a={i: 'A' + str(i) for i in range(5)} >>> a

  1. A. An exception is thrown
  2. B. {0: 'A0', 1: 'A1', 2: 'A2', 3: 'A3', 4: 'A4'}
  3. C. {0: 'A', 1: 'A', 2: 'A', 3: 'A', 4: 'A'}
  4. D. {0: '0', 1: '1', 2: '2', 3: '3', 4: '4'}
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Which of the following isn't true about dictionary keys?

  1. A. More than one key isn't allowed
  2. B. Keys must be immutable
  3. C. Keys must be integers
  4. D. When duplicate keys encountered, the last assignment wins
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What will be the output of the following Python code? >>> a={"a":1,"b":2,"c":3} >>> b=dict(zip(a.values(),a.keys())) >>> b

  1. A. {'a': 1, 'b': 2, 'c': 3}
  2. B. An exception is thrown
  3. C. {'a': 'b': 'c': }
  4. D. {1: 'a', 2: 'b', 3: 'c'}
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What will be the output of the following Python code? >>> import collections >>> b=dict() >>> b=collections.defaultdict(lambda: 7) >>> b[4]

  1. A. 4
  2. B. 0
  3. C. An exception is thrown
  4. D. 7
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What will be the output of the following Python code? >>> a={'B':5,'A':9,'C':7} >>> sorted(a)

  1. A. ['A','B','C']
  2. B. ['B','C','A']
  3. C. [5,7,9]
  4. D. [9,5,7]
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What will be the output of the following Python code snippet? a={} a['a']=1 a['b']=[2,3,4] print(a)

  1. A. Exception is thrown
  2. B. {'b': [2], 'a': 1}
  3. C. {'b': [2], 'a': [3]}
  4. D. {'b': [2, 3, 4], 'a': 1}
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Suppose d = {"john":40, "peter":45}, what happens when we try to retrieve a value using the expression d["susan"]?

  1. A. Since "susan" is not a value in the set, Python raises a KeyError exception
  2. B. It is executed fine and no exception is raised, and it returns None
  3. C. Since "susan" is not a key in the set, Python raises a KeyError exception
  4. D. Since "susan" is not a key in the set, Python raises a syntax error
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