Is there an API to get (value, prefix, unit) ?

[FabriceSalvaire]

For a particular software (Spice), I need to know for a quantity, the float value, the prefix like pico nano etc., and the unit like meter.
It is because it is not case-sensitive, thus m and M means milli, and mega is Meg.
I could not find the API that permit to properly write a custom formatter.

[hgrecco]

You can do something like:

>>> ureg.parse_unit_name("millisecond")
(('milli', 'second', ''),)

It returns a list of triplets (prefix, unit, suffix). It is a list because sometimes multiple combinations could match, depending on the definition file. Do you need a custom formatter or a custom parser?