Functional Python Programming - Second Edition

Extending a simple loop

We have two kinds of extensions we could factor into a simple loop. We'll look first at a filter extension. In this case, we may be rejecting values from further consideration. They may be data outliers, or perhaps source data that's improperly formatted. Then, we'll look at mapping source data by performing a simple transformation to create new objects from the original objects. In our case, we'll be transforming strings to floating-point numbers. The idea of extending a simple for statement with a mapping, however, applies to many situations. We'll look at refactoring the above pairs() function. What if we need to adjust the sequence of points to discard a value? This will introduce a filter extension that rejects ...