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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.
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Sitio webPyPI DLs/monthGitHub StarsUsed byBuilt-in unitsBuilt-in constantsArbitrary prefixesnp scalar arraynp object arrayDecimalFractionUncertaintiesstringabsolute °CdBSintaxisComentarios
scipy.constantsscipy.org/...167,3857,087181,360 50 400 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/...55,4246,92418,324 200?- u.mega*u.meter but not u.megameterNo array([1, 2, 3])*u.m- converts to sympy- converts to sympycm = u.m/100
astropy.unitsastropy.org/...11,3582,43513,777No-15.1 * u.meter / (32.0 * u.second)
Pintgithub.com/...35,7461,1281,579 Mm, GV, etc. array([1,2,3])*ureg.m or ureg.m*array([1,2,3])No ValueError built-inNoV = 1*ureg.dm**3
unytreadthedocs.io/...24329 101 33 km4*m + 3*cm - 5*ft + 6*yard
Quantitiesreadthedocs.org3,917147231 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/...43036 built-in
Buckinghamgithub.com/...361200 53NoV = Number(1,dims='decimeter^3')Single file
Unumbitbucket.org/...334
natugithub.io/...315 40 m*array([1, 2, 3]) array([1, 2, 3])*mNoNoNoV = 1*dm**3weird format for dB, Hz != 1/s, "pre-release state"
misugithub.com/...308110
Magnitudejuanreyero.com/...2381631
udunitspygithub.com/...18820Python wrapper for UDUNITS2
DimPycam.ac.uk/...0
Scalarrussp.us/...0
ScientificPython PhysicalQuantitiescnrs-orleans.fr/...0
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2022-11-10 15:25:54
2016-03-06 19:38:38
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