type-checking support in Python?

[Lawrence D'Oliveiro]

In message
<1df0ae7e-d5c5-4839-9788-703cd58232c5 at q9g2000hsb.googlegroups.com>, Bas
wrote:

> What they taught me as a physics undergrad is to always convert random
> units given as input to SI units as soon as possible, do all your
> calculations internally in SI units and (only if really needed)
> convert back to arbitrary units on output.

If only NASA's Mars Climate Orbiter engineers had followed that rule. :)