11.2 Reducing with operator module functions
We’ll look at one more way that we can use the operator module definitions: we can use them with the built-in functools.reduce() function. The sum() function, for example, can be implemented as follows:
sum = functools.partial(functools.reduce, operator.add)This creates a partially evaluated version of the reduce() function with the first argument supplied. In this case, it’s the + operator, implemented via the operator.add() function.
If we have a requirement for a similar function that computes a product, we can define it like this:
prod = functools.partial(functools.reduce, operator.mul)This follows the pattern shown in the previous example. We have a partially evaluated reduce() function with the first argument of the * operator, as implemented by the operator.mul() function.
It’s not clear whether we can do similar things with too many of the other operators. We might be able to find a use for the operator.concat...
