SI units and quantities library
Project description
siquant is a simple pure python 3 library to make dimensional analysis painless.
Getting Started
Dimensional Analysis
>>> from siquant.systems import si
>>> force = 100 * si.kilonewtons
>>> moment_arm = 50 * si.meters
>>> torque = force * moment_arm
>>> torque.quantity
5000
>>> str(torque.units)
'1000*kg**1*m**2*s**-2'
>>> torque.get_as(si.newtons * si.meters)
5000000.0
>>> torque.get_as(si.newtons)
Traceback (most recent call last):
...
siquant.exceptions.UnitMismatchError: ...
>>> torque = torque.cvt_to(si.newtons * si.meters)
>>> torque.quantity
5000000.0
>>> str(torque.units)
'1*kg**1*m**2*s**-2'Validation
>>> from siquant.dimensions import force, area, stress
>>> from siquant.systems import si
>>> def normal_stress(force_q, area_q):
... assert force_q.is_of(force)
... assert area_q.is_of(area)
... return force_q / area_q
>>> stress_q = normal_stress(1 * si.newtons, 1 * si.meters ** 2)
>>> stress_q.is_of(stress)
True
>>> stress_q.is_of(area)
FalseSometimes you might want to check for dimensions that aren’t provided by default.
>>> from siquant.dimensions import SIDimensions
>>> from siquant.systems import si
>>> new_dim = SIDimensions(kg=1, m=1, s=1, k=1, a=1, mol=1, cd=1)
>>> dist_q = 1 * si.meters
>>> dist_q.is_of(new_dim)
FalseNormalization
>>> from siquant import ScalarQuantity
>>> from siquant.systems import si
>>> meters_cvt = ScalarQuantity.As(si.meters)
>>> dist_q = meters_cvt(1000 * si.millimeters)
>>> dist_q.quantity
1
>>> dist_q = meters_cvt(1000 * si.meters)
>>> dist_q.quantity
1000
>>> dist_q = meters_cvt(1000)
>>> dist_q.quantity
1000New Units
SIUnit can be created directly by factory:
>>> from siquant.units import SIUnit
>>> fathom = SIUnit.Unit(1.8288, m=1)
SIUnit(1.8288, (0, 1, 0, 0, 0, 0, 0))Alternatively they can be derived:
>>> from siquant.systems import si
>>> rpm = si.unity / si.minutes
>>> rpm
SIUnit(0.016667, (0, 0, -1, 0, 0, 0, 0))Release history Release notifications | RSS feed
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siquant-3.0.5.tar.gz
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