PySets is a combination of a couple of things. For one, it's a beginners project and my first published module. Secondly, it's a tool to help people who like me who are slightly annoyed at how similar yet different the concept of mathematical sets is to programming arrays (python lists).

Arrays come in one form, which is fairly universal.

[1, 2, 3, 4, 5]

Sets come in three forms. The first is Semantic Description, where the set is specified in writing.

Set A is the set of integers greater than zero and less than six.

The second form is known as Roster Definition. This is where the elements of the set are written out. (This form is closest to an array)

Set A = {1, 2, 3, 4, 5}

The last form is known as Set-Builder Notation. This is a more complex form used more often to present a set, and it can contains a Semantic Description inside it.

Set A = {X | X is greater than zero and less than six. }

There are some small differences in how the elements (or members) of a set are different than those of an array.

Namely, sets begin counting at 1, this is unlike arrays, in which the first element is element zero.

Also unlike arrays, sets cannot contain duplicates, all elements must be unique. The order the set is in also doesn't matter.