Question

What is the list comprehension equivalent for: list(map(lambda x:x**-1, [1, 2, 3]))?

(a) [1|x for x in [1, 2, 3]]

(b) [-1**x for x in [1, 2, 3]]

(c) [x**-1 for x in [1, 2, 3]]

(d) [x^-1 for x in range(4)]

This question was posed to me during a job interview.

I'd like to ask this question from List Comprehension topic in chapter Lists & List Comprehension of Python

Answer 1

Right answer is (c) [x**-1 for x in [1, 2, 3]]

To explain I would say: The output of the function list(map(lambda x:x**-1, [1, 2, 3])) is [1.0, 0.5, 0.3333333333333333] and that of the list comprehension [x**-1 for x in [1, 2, 3]] is [1.0, 0.5, 0.3333333333333333]. Hence the answer is: [x**-1 for x in [1, 2, 3]].