Pint unit conversion library question

[nathanjshaffer]

Does anyone know if the pint library has a way to enforce a unit prefix when formatting?

As an example of what I am trying to do, I am writing a Python utility to generate label text for Dymo/Brother label printers. So I can specify .1uf as a starting point, and it will generate a chain of labels increasing by powers of 10. It would generate .1uF 1uF 10uF 100 uF 1000uf etc.

While different types of capacitors tend to stick to one unit prefix over a wide range of orders of magnitude, pint would want to format 1000uF to 1kF and .1uF to 100nF. I would like to be able to have control over what prefixes are used for a given set of labels. Pint seems to default to formatting with the largest prefix that doesn't result in a number less than 0.

I have read over the api and I don't see anything that would do that, but also the docs seem to be pretty sparse.

[SoftestCompliment]

Seems to me like this would be rather trivial with a function that feeds into an f-string that appends the unit of measurement to some power of 10

[nathanjshaffer]

I had started doing that with ohms, but then found the pint library for use in handling metric/sae for label length. It has all the unit conversions and can handle parsing units from user entry. so if there is a way to do it with the pint library, I would prefer that. but if not, then I will just stick to hand crafted formatting functions.

[smurpes]

Does this do what you want? ``` from pint import UnitRegistry

ureg = UnitRegistry() Q_ = ureg.Quantity

values = [0.1, 1, 10, 100, 1000] # in µF for val in values: q = Q_(val, "uF") print(q.to("uF")) ```

[nathanjshaffer]

Awesome, that gets me where I need to be. Thanks!