UnitPy is a Python package for defining, converting, and working with units.
The goal of the package is to be simple, straightforward, and performant.
This package directly implements NIST (National Institute of Standards and Technology) official unit definitions.
Pip installable package:
pip install unitpy
Python 3.7 and up
from unitpy import U, Q, Unit, Quantity
# U = Unit
u = Unit("kilometer")
u = U("kilometer")
u = U("km")
u = U.kilometer
u = U.km
u = U("kilometer/hour")
u = U("km/h")
u = U.kilometer / U.hour
u = U.km / U.h
# properties
print(u.dimensionality) # [length] / [time]
print(u.dimensionless) # False
print(u.base_unit) # meter / second** Quantity = Value + Unit **
from unitpy import U, Q , Unit, Quantity
# Q = Quantity
q = 1 * U("kilometer/hour")
q = 1 * (U.kilometer / U.hour)
q = Quantity("1 km/h")
q = Q("1 kilometer per hour")
q = Q("1*kilometer/hour")
# properties
print(q.unit) # kilometer / hour
print(q.dimensionality) # [length] / [time]
print(q.dimensionless) # False
print(q.base_unit) # meter / secondfrom unitpy import U, Q , Unit, Quantity
# Q = Quantity
q = 1 * U("km/h")
q2 = q.to("mile per hour")
print(q2) # 0.6213711922 mile / hourfrom unitpy import U, Q
q = 1 * U("km/h")
q2 = 2.2 * U("mile per hour")
print(q2 + q) # 2.8213711923 mile / hour
print(q2 - q) # 1.5786288077 mile / hour
print(q2 * q) # 2.2 kilometer mile / hour**2
print(q2 / q) # 2.2 mile / kilometer
print((q2 / q).dimensionless) # TrueAbbreviations:
- fahrenheits: degF
- celsius: degC
- kelvin: degK, K
- rankine: degR
from unitpy import U, Q
q = 300 * U("K")
q2 = 200 * U("K")
print(q + q2) # 500.0 kelvin
print(q.to("degC")) # 26.85 Celsius
print(q.to("degF")) # 830.6344444444 Fahrenheit
print(q.to("degR")) # 166.6666666667 RankineTemperature units are non-multiplicative units. They are expressed with respect to a reference point (offset).
degC = 5/9 * (degF - 32)
Default behavior is absolute units.
For relative units use dedicated functions add_rel() or sub_rel().
from unitpy import U, Q
q = 10 * U("degC")
q2 = 5 * U("degC")
# absolute
print(q.to("K")) # 283.15 kelvin
print(q + q2) # 288.15 Celsius
print((q + q2).to("K")) # 561.3 kelvin
print(q - q2) # -268.15 Celsius
print((q - q2).to("K")) # 5.0 kelvin
# relative
print(q.add_rel(q2)) # 15 Celsius
print(q.sub_rel(q2)) # 5 Celsius
print(abs(-10 * U.degC)) # 10 Celsius- this package utilizes the American spellings "meter," "liter," and "ton"