How do you create a set in Python?

To create a set in Python, you can use curly braces or the set() constructor. This is because a set is an unordered collection of unique items that is defined by the syntax of enclosing elements in curly braces, for example, {1, 2, 3}. Alternatively, you can create a set using the set() function, which allows you to convert other iterable types like lists or tuples into a set. For example, set([1, 2, 3]) would also create a set with the elements 1, 2, and 3.

Using square brackets denotes a list, which is an ordered collection that can contain duplicate elements, making it unsuitable for creating a set. Parentheses are utilized to denote a tuple, which is also an ordered collection but immutable. The 'new' keyword is not used for creating sets or any other data structure in Python, as Python manages memory and object creation differently than some other programming languages. This understanding of set syntax and constructors is crucial when working with data collections in Python, ensuring you leverage their unique properties effectively.