siquant 3.0.5

维度分析

>>> fromsiquant.systemsimportsi>>> force=100*si.kilonewtons>>> moment_arm=50*si.meters>>> torque=force*moment_arm>>> torque.quantity5000
>>> 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.quantity5000000.0
>>> str(torque.units)'1*kg**1*m**2*s**-2'

验证

>>> fromsiquant.dimensionsimportforce,area,stress>>> fromsiquant.systemsimportsi>>> defnormal_stress(force_q,area_q):... assertforce_q.is_of(force)... assertarea_q.is_of(area)... returnforce_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)False

有时可能需要检查默认情况下未提供的维度。

>>> fromsiquant.dimensionsimportSIDimensions>>> fromsiquant.systemsimportsi>>> 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)False

标准化

>>> fromsiquantimportScalarQuantity>>> fromsiquant.systemsimportsi>>> meters_cvt=ScalarQuantity.As(si.meters)>>> dist_q=meters_cvt(1000*si.millimeters)>>> dist_q.quantity1

>>> dist_q=meters_cvt(1000*si.meters)>>> dist_q.quantity1000

>>> dist_q=meters_cvt(1000)>>> dist_q.quantity1000