def test_zero_and_one(self):
unitses = [
Units.scalar,
Units.parse('GROM'),
]
for u in unitses:
self.assertIsInstance(u.zero, Value)
self.assertIsInstance(u.one, Value)
self.assertEqual(Decimal('0'), u.zero.amount)
self.assertEqual(Decimal('1'), u.one.amount)
self.assertEqual(Units.scalar.one, u.one / u.one)
self.assertEqual(u.zero, u.one * Units.scalar.zero)
self.assertIs(u**2, (u.zero * u.one).units)
def parse(cls, text):
m = cls._rgx.match(text)
if m is None:
raise cls.ParseError("Could not parse Value: {!r}", text)
dectext = m.group("decimal")
try:
decimal = Decimal(dectext)
except InvalidOperation as e:
raise cls.ParseError("Could not parse decimal {!r} of Value: {}", dectext, e)
unitext = m.group("units")
if unitext is None:
units = Units.scalar
else:
units = Units.parse(unitext)
return cls(decimal, units)
def test_from_string(self):
inputs = [
'0',
'1',
'1.00',
'+17e3',
'-42.07000',
]
unitses = [
Units.scalar,
Units.parse('GROM'),
]
for units in unitses:
for i in inputs:
self.assertEqual(
units.from_string(i),
Value(Decimal(i), units),
)
def setUp(self):
self.meter = Units.parse('meter')