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Python units/quantities packages

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There are far too many different packages for unit conversion / quantities calculations in Python. Developers should cooperate on one package instead of fragmenting development across many different ones. This documents which features are supported by each package.
Link
WebsitePyPI DLs/monthGitHub StarsUsed byBuilt-in unitsBuilt-in constantsArbitrary prefixesnp scalar arraynp object arrayDecimalFractionUncertaintiesstringabsolute °CdBSyntaxComments
scipy.constantsscipy.org/...167,3857,087181,360Yes 50Yes 400 in CODATANo- no unit objects- no unit objects- no unit objects- no unit objects- no unit objects- no unit objectsNoNoconstants.c == 299792458.0Just tables of numerical constants; unit-aware calculations not supported. scipy.constants.physical_constants specifies units as strings and uncertainties. Could be used to supply other packages with coefficients.
sympy.physics.unitssympy.org/...55,4246,92418,324Yes 200?Yes- u.mega*u.meter but not u.megameterNoYes array([1, 2, 3])*u.m- converts to sympy- converts to sympycm = u.m/100
astropy.unitsastropy.org/...11,3582,43513,777YesYesNoYes-YesYes15.1 * u.meter / (32.0 * u.second)
Pintgithub.com/...35,7461,1281,579YesYesYes Mm, GV, etc.Yes array([1,2,3])*ureg.m or ureg.m*array([1,2,3])No ValueErrorYesYesYes built-inYesYesNoV = 1*ureg.dm**3
unytreadthedocs.io/...24329Yes 101Yes 33Yes km4*m + 3*cm - 5*ft + 6*yard
Quantitiesreadthedocs.org3,917147231Yes array([1,2,3]) * pq.JNo
Unitsbitbucket.org/...1,376
numericalunitspython.org/...44569Overflow issues, random set of units = not deterministic, need to do calculations twice to confirm they are being done correctly
SciMath Unitsreadthedocs.org/...43036Yes built-in
Buckinghamgithub.com/...361200Yes 53NoYesV = Number(1,dims='decimeter^3')Single file
Unumbitbucket.org/...334
natugithub.io/...315YesYes 40YesYes m*array([1, 2, 3])Yes array([1, 2, 3])*mNoNoYesNoYesYesV = 1*dm**3weird format for dB, Hz != 1/s, "pre-release state"
misugithub.com/...308110
Magnitudejuanreyero.com/...2381631YesYesYes
udunitspygithub.com/...18820Python wrapper for UDUNITS2
scinumtools.unitsgithub.com/...4715YesYesYesYesYesYesYesYesYesYes K, Cel, degF, degRYes dB, Np, dBm, dBmW, ... (both B and dB)quant(3, 'J').to('kg*m2/s2')
quant([5.9e-4, 5.2e+5], 'J*s-1').to('W')
33*unit('kg'), const('c')
3*unit.m/unit.s
No registries needed like for Pint. Documentation is available here: github.io/...
DimPycam.ac.uk/...0
Scalarrussp.us/...0
ScientificPython PhysicalQuantitiescnrs-orleans.fr/...0
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Jun. 1st 2024 10:32:47 AM
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  • LuisFuture on Dec. 21st 2023 12:20:30 PM

    Great comparison on Python units and quantities packages! For those looking to implement such tools in a project, partnering with a top Python team can make a huge difference. Check out Attract Group, recently hailed as a leading Python and Django firm by Techreviewer, check top python and django company in 2021. Their expertise could be invaluable for your project's success.