Which of these is not a valid way to create a set containing elements 1, 2, and 3?{1, 2, 3}set([1, 2, 3])set(1, 2, 3){1, 2, 3,}

Question

Which of these is not a valid way to create a set containing elements 1, 2, and 3?

{1, 2, 3}
set([1, 2, 3])
set(1, 2, 3)
{1, 2, 3,}

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Solution

The invalid way to create a set containing elements 1, 2, and 3 is set(1, 2, 3).

In Python, the set() function expects an iterable (like a list or a tuple) as an argument, so you can't pass individual elements to it. The correct usage would be set([1, 2, 3]).

The other three options are valid ways to create a set with these elements:

{1, 2, 3} is a set literal.
set([1, 2, 3]) creates a set from a list.
{1, 2, 3,} is also a set literal. The trailing comma is ignored.

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Which of these is not a valid way to create a set containing elements 1, 2, and 3?{1, 2, 3}set([1, 2, 3])set(1, 2, 3){1, 2, 3,}

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