Python Collection Counters

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    Question 1

    What is the primary purpose of the Counter class in Python's collections module?

    • To create a mapping of unique keys to their values

    • To count the occurrences of elements in an iterable

    • To perform arithmetic operations on numbers

    • To sort elements in a collection

    Question 2

    Which method would you use to retrieve the most common elements from a Counter object?

    • retrieve_common()

    • most_common()

    • get_top()

    • frequent_elements()

    Question 3

    When using the subtract() method on a Counter object, what happens to the counts of elements?

    • Counts are doubled

    • Counts can go negative

    • Counts are reset to zero

    • Counts are ignored

    Question 4

    How can you initialize a Counter with keyword arguments?

    • Counter(**{key value})

    • Counter({key value})

    • Counter(key=value)

    • Counter([key=value])

    Question 5

    Which of the following operations is NOT supported by Counter objects?

    • Intersection

    • Division

    • Addition

    • Subtraction

    Question 6

    What will be the output of accessing a non-existent key in a Counter object?

    • None

    • An error is raised

    • 0

    • False

    Question 7

    What will be the output of the following code?

    Python 
    from collections import Counter
c = Counter("aabbbcccc")
print(c.most_common(1))


    • ['c']

    • [('c', 4)]

    • [('a', 2)]

    • [('b', 3)]

    Question 8

    Which of the following can NOT be passed directly to Counter()?

    • A string

    • A dictionary

    • A set

    • A list

    Question 9

    What does Counter('aabb') + Counter('bccd') return?

    • Counter({'a': 2, 'b': 3, 'c': 2, 'd': 1})

    • Counter({'a': 2, 'b': 1, 'c': 2, 'd': 1})

    • Counter({'a': 2, 'b': 2, 'c': 2})

    • Counter({'a': 2, 'b': 2, 'c': 2, 'd': 0})

    Question 10

    What is the result of this code?

    Python 
    from collections import Counter
c1 = Counter(a=3, b=1)
c2 = Counter(a=1, b=2)
print(c1 - c2)


    • Counter({'a': 2, 'b': -1})

    • Counter({'a': 2})

    • Counter({'b': -1})

    • Counter({'a': 4, 'b': 3})

    There are 11 questions to complete.

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