gabbpuy / PyQuantity

Quantities in Python

PyQuantity

A library to deal with quantities, that have units. Quantities reduce themselves to the lowest SI prefix, see Units.RealWorld to configure prefixes that aren't normally used.

Usage

from quantity.quantity import Quantity
import quantity.unit.units as units 

length = Quantity(5, units.metre)
width = Quantity(4,  units.metre)
area = length * width
print(area)
'20.0 m²'
area / length
'4.0 m'

unit.units defines SI units, which are looked up by symbol.

from quantity.quantity import Quantity

q = Quantity(1.0, "MV")
print(q)
'1.0 MV'
q = Quantity(1000000, 'V')
print(q)
'1.0 MV'
print(q.to('V'))
1000000.0

Many simple conversions are also provided

from quantity.quantity import Quantity

volts = Quantity(10, 'V')
amps = Quantity(100, 'A')
volts * amps
'1.0 kW'
volts / amps
'100.0 mΩ'

You can define your own units. We can get frames per second by defining frames.

from quantity.unit import Unit
from quantity.quantity import Quantity

frame = Unit('f', "frame")
frames = Quantity(432000, "frame")
running_time = Quantity(120 * 60, 's')
fps = frames / running_time
print(fps)
'60.0 f/s'