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import itertools
from pint import pi_theorem
from pint.testsuite import QuantityTestCase
class TestPiTheorem(QuantityTestCase):
FORCE_NDARRAY = False
def test_simple(self):
# simple movement
with self.capture_log() as buffer:
self.assertEqual(
pi_theorem({"V": "m/s", "T": "s", "L": "m"}),
[{"V": 1, "T": 1, "L": -1}],
)
# pendulum
self.assertEqual(
pi_theorem({"T": "s", "M": "grams", "L": "m", "g": "m/s**2"}),
[{"g": 1, "T": 2, "L": -1}],
)
self.assertEqual(len(buffer), 7)
def test_inputs(self):
V = "km/hour"
T = "ms"
L = "cm"
f1 = lambda x: x
f2 = lambda x: self.Q_(1, x)
f3 = lambda x: self.Q_(1, x).units
f4 = lambda x: self.Q_(1, x).dimensionality
fs = f1, f2, f3, f4
for fv, ft, fl in itertools.product(fs, fs, fs):
qv = fv(V)
qt = ft(T)
ql = ft(L)
self.assertEqual(
self.ureg.pi_theorem({"V": qv, "T": qt, "L": ql}),
[{"V": 1.0, "T": 1.0, "L": -1.0}],
)
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