Comprehension & Generator Expression

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    Question 1

    Which syntax correctly represents a list comprehension?

    • {x for x in range(5)}

    • [x for x in range(5)]

    • (x for x in range(5))

    • x in [range(5)]

    Question 2

    What is the output of this list comprehension?

    Python 
    res = [x**2 for x in range(1, 4)]
print(res)


    • [1, 2, 3]

    • [1, 4, 9]

    • (1, 4, 9)

    • {1, 4, 9}

    Question 3

    Which comprehension will create a dictionary of numbers and their cubes (1 to 3)?

    • {x: x*x for x in range(1, 4)}

    • {x: x**3 for x in range(1, 4)}

    • {x*x: x for x in range(1, 4)}

    • dict(x: x**3 for x in range(1, 4))

    Question 4

    What will the following code return?

    Python 
    a = [1, 2, 2, 3, 4]
res = {x for x in a if x % 2 == 0}
print(res)



    • [2, 4]

    • {2, 2, 4}

    • {2, 4}

    • (2, 4)

    Question 5

    What is the output of this list comprehension?

    Python 
    res = [x for x in range(5) if x % 2 == 0]
print(res)


    • [1, 3, 5]

    • [0, 2, 4]

    • [0, 1, 2, 3, 4]

    • [2, 4]

    Question 6

    Which comprehension creates a dictionary from two lists using zip()?

    Python 
    states = ["Texas", "California"]
capitals = ["Austin", "Sacramento"]


    • {s: c for c, s in zip(states, capitals)}

    • {state: capital for state, capital in zip(states, capitals)}

    • {state for state in states}

    • dict(zip(states, capitals))

    Question 7

    Which of these best describes a set comprehension?

    • Creates a sorted list

    • Creates a tuple

    • Creates a collection of unique elements

    • Creates a dictionary

    Question 8

    What is the output of this set comprehension?

    Python 
    res = {x**2 for x in [1, 2, 2, 3]}
print(res)


    • [1, 4, 9]

    • {1, 4, 9}

    • (1, 4, 9)

    • {1:1, 2:4, 3:9}

    Question 9

    Which statement about dictionary comprehensions is TRUE?

    • Keys must be strings

    • Values must be lists

    • Comprehension must have ‘if’ condition

    • Key-value pairs are generated dynamically

    Question 10

    What does this expression return?

    Python 
    [x*2 for x in range(4) if x != 2]

    • [0, 2, 6, 8]

    • [0, 2, 4, 6]

    • [2, 6, 8]

    • [0, 2, 6]

    There are 12 questions to complete.

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