Question: Is there a way to return a list of direct conversion options?

[Nathan-Harlan]

Looking for a way to see all available direct conversions, especially for basic dimensions. I realize this could get messy if every possible option was returned.

For Example
[length]

• meter
• inch
• foot
• custom_unit
• etc

Thanks for all the effort on a great library btw!

[keewis]

you can generate that list yourself:

In [13]: import pint
    ...: 
    ...: ureg = pint.UnitRegistry()
    ...: 
    ...: def direct_conversions(ureg, unit):
    ...:     def unit_dimensionality(ureg, name):
    ...:         unit = getattr(ureg, name, None)
    ...: 
    ...:         if unit is None or not isinstance(unit, pint.Unit):
    ...:             return {}
    ...: 
    ...:         return unit.dimensionality
    ...: 
    ...:     if isinstance(unit, str):
    ...:         unit = ureg.parse_units(unit)
    ...: 
    ...:     return [
    ...:         name
    ...:         for name in ureg
    ...:         if unit.dimensionality == unit_dimensionality(ureg, name)
    ...:     ]
    ...: 
    ...: conversions = direct_conversions(ureg, "m / s ** 2")
    ...: {name: getattr(ureg, name).dimensionality for name in conversions}
Out[13]: 
{'Gal': <UnitsContainer({'[length]': 1, '[time]': -2})>,
 'g0': <UnitsContainer({'[length]': 1, '[time]': -2})>,
 'g_0': <UnitsContainer({'[length]': 1, '[time]': -2})>,
 'g_n': <UnitsContainer({'[length]': 1, '[time]': -2})>,
 'galileo': <UnitsContainer({'[length]': 1, '[time]': -2})>,
 'gravity': <UnitsContainer({'[length]': 1, '[time]': -2})>,
 'standard_gravity': <UnitsContainer({'[length]': 1, '[time]': -2})>}

Edit: although this suggests converting between deg / s and rpm, so use with caution

[Nathan-Harlan]

That works for my use case. Thanks!