We'll look at a more complex kind of generator expression to map data values from one kind of data to another. In this case, we'll apply a fairly complex function to individual data values created by a generator.
We'll call these non-generator functions scalar, as they work with simple atomic values. To work with collections of data, a scalar function will be embedded in a generator expression.
To continue the example started earlier, we'll provide a haversine function and then use a generator expression to apply a scalar haversine() function to a sequence of pairs from our KML file.
The haversine() function looks like the following code:
from math import radians, sin, cos, sqrt, asin from ...
