def real_mapper(prop):
"""Mapping methods for RealBounds."""
if 'uncertainty' in prop['scalars'][0]:
if prop['units'] == 'eV': # Arbitrarily convert to attojoules
mean = convert_units(value=float(prop['scalars'][0]['value']),
starting_unit=prop['units'],
final_unit='aJ'
)
std = convert_units(value=float(prop['scalars'][0]['value']),
starting_unit=prop['units'],
final_unit='aJ'
)
val = NormalReal(mean=mean,
units='aJ',
std=std
)
else:
val = NormalReal(mean=float(prop['scalars'][0]['value']),
units=prop['units'],
std=float(prop['scalars'][0]['uncertainty'])
)
else:
val = NominalReal(nominal=float(prop['scalars'][0]['value']),
units=prop['units']
)
return val
def test_file_change():
"""Test that swapping units files works."""
assert convert_units(1, 'm', 'cm') == 100
with pytest.raises(UndefinedUnitError):
assert convert_units(1, 'usd', 'usd') == 1
with _change_units(filename=pkg_resources.resource_filename("gemd.units",
"tests/test_units.txt")):
with pytest.raises(UndefinedUnitError):
assert convert_units(1, 'm', 'cm') == 100
assert convert_units(1, 'usd', 'usd') == 1
assert convert_units(1, 'm', 'cm') == 100 # And verify we're back to normal
def _convert_bounds(self, target_units):
"""
Convert the bounds to the target unit system, or None if not possible.
Parameters
----------
target_units: str
The units to convert into.
Returns
-------
tuple (float, float)
A tuple of the (lower_bound, upper_bound) in the target units.
"""
try:
lower_bound = units.convert_units(self.lower_bound,
self.default_units, target_units)
upper_bound = units.convert_units(self.upper_bound,
self.default_units, target_units)
return lower_bound, upper_bound
except units.IncompatibleUnitsError:
return None, None
def test_conversion():
"""Tests that check if particular units are interoperable."""
conversions = {"in_lb": "foot_pound"}
for source, dest in conversions.items():
assert convert_units(convert_units(1, source, dest), dest, source) == 1