On Sun, Jan 29, 2017 at 08:23:05AM +0000, Martin Panter wrote:
> Why do you name the methods is_finite() etc with underscores, when the 
> existing methods math.isfinite() etc do not have underscores? Seems it 
> would add unnecessary confusion.

The idea is to enable duck-typing between float and Decimal. Instead of:

if isinstance(x, float):
    math.isfinite(x)
else:
    x.is_finite()

we can just say

x.is_finite() 

on both floats and decimals.