One of the significant values of curried functions is the ability to combine them via functional composition. We looked at functional composition in Chapter 5, Higher-order Functions, and Chapter 11, Decorator Design Techniques.

When we've created a curried function, we can easily perform function composition to create a new, more complex curried function. In this case, the PyMonad package defines the * operator for composing two functions. To show how this works, we'll define two curried functions that we can compose. First, we'll define a function that computes the product, and then we'll define a function that computes a specialized range of values.

Here's our first function that computes the product:

import  operator
prod = myreduce(operator.mul)

This is based on our curried myreduce() function that was defined previously. It uses the operator.mul() function to compute a "times-reduction" of an iterable: we can call a product...