> > > > I guess you could call the associative law of multiplication "dumb > > > luck", but most mathematicians will consider that hate speech. > > > > My apologies for not understanding your example. The counter > > example I had in my head, and should have written down, > > was something like: > > > > 15mpg * 7l == how many miles? >
Using pint: In [76]: U = pint.UnitRegistry() In [77]: (15 * U.miles / U.gallons * 7 * U.liter).to('miles') Out[77]: 27.7380654976056 <Unit('mile')> A bit verbose, perhaps, but to me clear, and the operator precedence rules seem to "just work". And it you want it a tad less verbose, you can give some of those units names: In [78]: mpg = U.miles / U.gallons In [79]: l = U.liter In [80]: (15 * mpg * 7 * l).to('miles') Out[80]: 27.7380654976056 <Unit('mile')> My question for the folks that want units built in to Python is "what's so hard about that? Ricky wrote: "Python is so painful to use for units I've actually avoided it," Really? have you tried pint? or anything else? what is so painful about this? -CHB -- Christopher Barker, PhD (Chris) Python Language Consulting - Teaching - Scientific Software Development - Desktop GUI and Web Development - wxPython, numpy, scipy, Cython
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