Link | Website | PyPI DLs/month | GitHub Stars | Used by | Built-in units | Built-in constants | Arbitrary prefixes | np scalar array | np object array | Decimal | Fraction | Uncertainties | string | absolute °C | dB | Syntax | Comments |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| scipy.constants | scipy.org/... | 167,385 | 7,087 | 181,360 | Yes 50 | Yes 400 in CODATA | No | - no unit objects | - no unit objects | - no unit objects | - no unit objects | - no unit objects | - no unit objects | No | No | constants.c == 299792458.0 | Just 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.units | sympy.org/... | 55,424 | 6,924 | 18,324 | Yes 200? | Yes | - u.mega*u.meter but not u.megameter | No | Yes array([1, 2, 3])*u.m | - converts to sympy | - converts to sympy | cm = u.m/100 | |||||
| astropy.units | astropy.org/... | 11,358 | 2,435 | 13,777 | Yes | Yes | No | Yes | - | Yes | Yes | 15.1 * u.meter / (32.0 * u.second) | |||||
| Pint | github.com/... | 35,746 | 1,128 | 1,579 | Yes | Yes | Yes Mm, GV, etc. | Yes array([1,2,3])*ureg.m or ureg.m*array([1,2,3]) | No ValueError | Yes | Yes | Yes built-in | Yes | Yes | No | V = 1*ureg.dm**3 | |
| unyt | readthedocs.io/... | 243 | 29 | Yes 101 | Yes 33 | Yes km | 4*m + 3*cm - 5*ft + 6*yard | ||||||||||
| Quantities | readthedocs.org | 3,917 | 147 | 231 | Yes array([1,2,3]) * pq.J | No | |||||||||||
| Units | bitbucket.org/... | 1,376 | |||||||||||||||
| numericalunits | python.org/... | 445 | 69 | Overflow issues, random set of units = not deterministic, need to do calculations twice to confirm they are being done correctly | |||||||||||||
| SciMath Units | readthedocs.org/... | 430 | 36 | Yes built-in | |||||||||||||
| Buckingham | github.com/... | 361 | 20 | 0 | Yes 53 | No | Yes | V = Number(1,dims='decimeter^3') | Single file | ||||||||
| Unum | bitbucket.org/... | 334 | |||||||||||||||
| natu | github.io/... | 315 | Yes | Yes 40 | Yes | Yes m*array([1, 2, 3]) | Yes array([1, 2, 3])*m | No | No | Yes | No | Yes | Yes | V = 1*dm**3 | weird format for dB, Hz != 1/s, "pre-release state" | ||
| misu | github.com/... | 308 | 11 | 0 | |||||||||||||
| Magnitude | juanreyero.com/... | 238 | 16 | 31 | Yes | Yes | Yes | ||||||||||
| udunitspy | github.com/... | 188 | 2 | 0 | Python wrapper for UDUNITS2 | ||||||||||||
| DimPy | cam.ac.uk/... | 0 | |||||||||||||||
| Scalar | russp.us/... | 0 | |||||||||||||||
| ScientificPython PhysicalQuantities | cnrs-orleans.fr/... | 0 |
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