If a class has only one public method (other than its __init__)
it should be replaced with a function.
Convert the single public method into a function.
If there is an __init__ and it sets attributes on the self
then rename the __init__ method and remove the self parameter
Make the public method an inner function and return that.
Delete the class.
In this example the class only has a single method. This method does not need to be in its own
class. It should be a method on its own that takes a and b as parameters.