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import unittest
import numpy as np
from .. import units as pq
from .. import quantity
from .common import TestCase
class TestConversion(TestCase):
def test_inplace_conversion(self):
for u in ('ft', 'feet', pq.ft):
q = 10*pq.m
q.units = u
self.assertQuantityEqual(q, 32.80839895 * pq.ft)
def test_rescale(self):
for u in ('ft', 'feet', pq.ft):
self.assertQuantityEqual((10*pq.m).rescale(u), 32.80839895 * pq.ft)
self.assertQuantityEqual((10 * pq.deg).rescale(pq.rad), 0.17453293 * pq.rad)
self.assertQuantityEqual(quantity.Quantity(10, pq.deg).rescale(pq.rad), 0.17453293 * pq.rad)
def test_rescale_preferred(self):
quantity.PREFERRED = [pq.mV, pq.pA]
q = 10*pq.V
self.assertQuantityEqual(q.rescale_preferred(), q.rescale(pq.mV))
q = 5*pq.A
self.assertQuantityEqual(q.rescale_preferred(), q.rescale(pq.pA))
quantity.PREFERRED = []
def test_rescale_preferred_failure(self):
quantity.PREFERRED = [pq.pA]
q = 10*pq.V
try:
self.assertQuantityEqual(q.rescale_preferred(), q.rescale(pq.mV))
except:
self.assertTrue(True)
else:
self.assertTrue(False)
quantity.PREFERRED = []
def test_rescale_noargs(self):
quantity.PREFERRED = [pq.mV, pq.pA]
q = 10*pq.V
self.assertQuantityEqual(q.rescale(), q.rescale(pq.mV))
q = 5*pq.A
self.assertQuantityEqual(q.rescale(), q.rescale(pq.pA))
quantity.PREFERRED = []
def test_rescale_noargs_failure(self):
quantity.PREFERRED = [pq.pA]
q = 10*pq.V
try:
self.assertQuantityEqual(q.rescale_preferred(), q.rescale(pq.mV))
except:
self.assertTrue(True)
else:
self.assertTrue(False)
quantity.PREFERRED = []
def test_compound_reduction(self):
pc_per_cc = pq.CompoundUnit("pc/cm**3")
temp = pc_per_cc * pq.CompoundUnit('m/m**3')
self.assertQuantityEqual(
temp.simplified,
3.08568025e+22 / pq.m**4,
delta=1e17
)
self.assertQuantityEqual(
temp.rescale('pc**-4'),
2.79740021556e+88 / pq.pc**4,
delta=1e83
)
class TestDefaultUnits(TestCase):
def test_default_length(self):
pq.set_default_units(length='mm')
self.assertQuantityEqual(pq.m.simplified, 1000*pq.mm)
pq.set_default_units(length='m')
self.assertQuantityEqual(pq.m.simplified, pq.m)
self.assertQuantityEqual(pq.mm.simplified, 0.001*pq.m)
def test_default_system(self):
pq.set_default_units('cgs')
self.assertQuantityEqual(pq.kg.simplified, 1000*pq.g)
self.assertQuantityEqual(pq.m.simplified, 100*pq.cm)
pq.set_default_units('SI')
self.assertQuantityEqual(pq.g.simplified, 0.001*pq.kg)
self.assertQuantityEqual(pq.mm.simplified, 0.001*pq.m)
pq.set_default_units('cgs', length='mm')
self.assertQuantityEqual(pq.kg.simplified, 1000*pq.g)
self.assertQuantityEqual(pq.m.simplified, 1000*pq.mm)
# test a time default as well as mass and weight
pq.set_default_units('SI')
self.assertQuantityEqual(pq.min.simplified, 60*pq.sec)
class TestUnitInformation(TestCase):
def test_si(self):
pq.set_default_units(information='B')
self.assertQuantityEqual(pq.kB.simplified, pq.B*pq.kilo)
self.assertQuantityEqual(pq.MB.simplified, pq.B*pq.mega)
self.assertQuantityEqual(pq.GB.simplified, pq.B*pq.giga)
self.assertQuantityEqual(pq.TB.simplified, pq.B*pq.tera)
self.assertQuantityEqual(pq.PB.simplified, pq.B*pq.peta)
self.assertQuantityEqual(pq.EB.simplified, pq.B*pq.exa)
self.assertQuantityEqual(pq.ZB.simplified, pq.B*pq.zetta)
self.assertQuantityEqual(pq.YB.simplified, pq.B*pq.yotta)
def test_si_aliases(self):
prefixes = ['kilo', 'mega', 'giga', 'tera', 'peta', 'exa', 'zetta', 'yotta']
for prefix in prefixes:
self.assertQuantityEqual(pq.B.rescale(prefix + 'byte'), pq.B.rescale(prefix + 'bytes'))
self.assertQuantityEqual(pq.B.rescale(prefix + 'byte'), pq.B.rescale(prefix + 'octet'))
self.assertQuantityEqual(pq.B.rescale(prefix + 'byte'), pq.B.rescale(prefix + 'octets'))
def test_iec(self):
pq.set_default_units(information='B')
self.assertQuantityEqual(pq.KiB.simplified, pq.B*pq.kibi)
self.assertQuantityEqual(pq.MiB.simplified, pq.B*pq.mebi)
self.assertQuantityEqual(pq.GiB.simplified, pq.B*pq.gibi)
self.assertQuantityEqual(pq.TiB.simplified, pq.B*pq.tebi)
self.assertQuantityEqual(pq.PiB.simplified, pq.B*pq.pebi)
self.assertQuantityEqual(pq.EiB.simplified, pq.B*pq.exbi)
self.assertQuantityEqual(pq.ZiB.simplified, pq.B*pq.zebi)
self.assertQuantityEqual(pq.YiB.simplified, pq.B*pq.yobi)
def test_iec_aliases(self):
prefixes = ['kibi', 'mebi', 'gibi', 'tebi', 'pebi', 'exbi', 'zebi', 'yobi']
for prefix in prefixes:
self.assertQuantityEqual(pq.B.rescale(prefix + 'byte'), pq.B.rescale(prefix + 'bytes'))
self.assertQuantityEqual(pq.B.rescale(prefix + 'byte'), pq.B.rescale(prefix + 'octet'))
self.assertQuantityEqual(pq.B.rescale(prefix + 'byte'), pq.B.rescale(prefix + 'octets'))
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