In this exercise we are going to perform a difference on 2 sets of data. We will create a method on our
Set data structure called
difference. A difference of sets should compare two sets and return the items present in the first set that are absent in the second. This method should take another
Set as an argument and return the
difference of the two sets.
For example, if
setA = ['a','b','c'] and
setB = ['a','b','d','e'], then the difference of setA and setB is:
setA.difference(setB) = ['c'].
Setclass should have a