[Python-ideas] the Quantity pattern

I was looking at Martin Fowler's Quantity pattern earlier. http://martinfowler.com/ap2/quantity.html I remember writing this up as an idea for Fortran back in the early 80's, only to find a CACM paper from 1978 exploring the idea: "Incorporation of Units into Programming Languages", Karr & Loveman, May 1978. But it would still be a cool idea for Python. Perhaps it's already there and I haven't noticed? Bill