86 lines
2.1 KiB
Python
86 lines
2.1 KiB
Python
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from sympy.core.mul import Mul
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from sympy.core.numbers import Rational
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from sympy.core.singleton import S
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from sympy.core.symbol import (Symbol, symbols)
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from sympy.physics.units import Quantity, length, meter
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from sympy.physics.units.prefixes import PREFIXES, Prefix, prefix_unit, kilo, \
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kibi
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from sympy.physics.units.systems import SI
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x = Symbol('x')
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def test_prefix_operations():
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m = PREFIXES['m']
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k = PREFIXES['k']
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M = PREFIXES['M']
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dodeca = Prefix('dodeca', 'dd', 1, base=12)
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assert m * k == 1
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assert k * k == M
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assert 1 / m == k
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assert k / m == M
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assert dodeca * dodeca == 144
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assert 1 / dodeca == S.One / 12
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assert k / dodeca == S(1000) / 12
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assert dodeca / dodeca == 1
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m = Quantity("fake_meter")
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SI.set_quantity_dimension(m, S.One)
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SI.set_quantity_scale_factor(m, S.One)
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assert dodeca * m == 12 * m
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assert dodeca / m == 12 / m
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expr1 = kilo * 3
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assert isinstance(expr1, Mul)
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assert expr1.args == (3, kilo)
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expr2 = kilo * x
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assert isinstance(expr2, Mul)
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assert expr2.args == (x, kilo)
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expr3 = kilo / 3
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assert isinstance(expr3, Mul)
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assert expr3.args == (Rational(1, 3), kilo)
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assert expr3.args == (S.One/3, kilo)
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expr4 = kilo / x
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assert isinstance(expr4, Mul)
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assert expr4.args == (1/x, kilo)
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def test_prefix_unit():
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m = Quantity("fake_meter", abbrev="m")
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m.set_global_relative_scale_factor(1, meter)
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pref = {"m": PREFIXES["m"], "c": PREFIXES["c"], "d": PREFIXES["d"]}
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q1 = Quantity("millifake_meter", abbrev="mm")
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q2 = Quantity("centifake_meter", abbrev="cm")
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q3 = Quantity("decifake_meter", abbrev="dm")
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SI.set_quantity_dimension(q1, length)
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SI.set_quantity_scale_factor(q1, PREFIXES["m"])
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SI.set_quantity_scale_factor(q1, PREFIXES["c"])
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SI.set_quantity_scale_factor(q1, PREFIXES["d"])
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res = [q1, q2, q3]
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prefs = prefix_unit(m, pref)
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assert set(prefs) == set(res)
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assert {v.abbrev for v in prefs} == set(symbols("mm,cm,dm"))
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def test_bases():
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assert kilo.base == 10
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assert kibi.base == 2
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def test_repr():
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assert eval(repr(kilo)) == kilo
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assert eval(repr(kibi)) == kibi
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