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import itertools
import logging
from pint import pi_theorem
from pint.testsuite import QuantityTestCase
class TestPiTheorem(QuantityTestCase):
def test_simple(self, caplog):
# simple movement
with caplog.at_level(logging.DEBUG):
assert pi_theorem({"V": "m/s", "T": "s", "L": "m"}) == [
{"V": 1, "T": 1, "L": -1}
]
# pendulum
assert pi_theorem({"T": "s", "M": "grams", "L": "m", "g": "m/s**2"}) == [
{"g": 1, "T": 2, "L": -1}
]
assert len(caplog.records) == 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)
assert self.ureg.pi_theorem({"V": qv, "T": qt, "L": ql}) == [
{"V": 1.0, "T": 1.0, "L": -1.0}
]
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