engunits 0.1.1

Typed engineering quantities with SI-default storage, built on pint

Engineering Units

Typed engineering quantities with unit-preserving storage, built on pint.

Install

pip install engunits

Quick start

from engunits import Mass, Force, Velocity

# Create quantities -- input units are preserved, SI assumed when omitted
m = Mass(1000, "lb")       # stored as 1000 lb
f = Force(100, "N")

# Convert on demand
print(m("kg"))              # 453.592 kg
print(m.si())               # 453.592 kg
print(m.imperial())         # 1000 lb

# Cross-type arithmetic resolves automatically
a = f / Mass(10, "kg")      # -> Acceleration
print(a.si())                # 10 m / s ** 2

# Arithmetic preserves units
total = Mass(10, "lb") + Mass(5, "lb")   # 15 lb
ratio = Mass(30, "kg") / Mass(10, "kg")  # 3.0

# sum() works
sum([Mass(1, "kg"), Mass(2, "kg"), Mass(3, "kg")])  # Mass(6, 'kg')

Supported quantities (41)

SI Base

Class	SI Unit
Mass	kg
Length	m
Time	s
Temperature	K
Current	A
AmountOfSubstance	mol
LuminousIntensity	cd

Mechanics

Class	SI Unit
Velocity	m/s
Acceleration	m/s^2
Force	N
Moment	N*m
Energy	J
Power	W
Area	m^2
Volume	m^3
Density	kg/m^3
Pressure	Pa
Frequency	Hz
Momentum	kg*m/s
AngularVelocity	rad/s
AngularAcceleration	rad/s^2
MomentOfInertia	kg*m^2
SurfaceTension	N/m

Electromagnetism

Class	SI Unit
Voltage	V
Charge	C
Capacity	A*h
Resistance	ohm
Capacitance	F
Inductance	H
MagneticFlux	Wb
MagneticFluxDensity	T
Conductance	S
ElectricField	V/m

Fluid and Thermal

Class	SI Unit
DynamicViscosity	Pa*s
KinematicViscosity	m^2/s
MassFlowRate	kg/s
VolumetricFlowRate	m^3/s
ThermalConductivity	W/(m*K)
SpecificHeatCapacity	J/(kg*K)
HeatFlux	W/m^2

Optics

Class	SI Unit
Illuminance	lx

License

MIT