def create(cls, from_unit, to_unit, factor):
with scoped_session() as session:
obj0 = cls(from_unit=from_unit, to_unit=to_unit, factor=factor)
obj1 = cls(from_unit=to_unit, to_unit=from_unit, factor=1/factor)
session.add(obj0)
session.add(obj1)
reconfigure_units()
def _getitem(cls, key):
if isinstance(key, tuple):
f = cls.aliases[key[0].lower()] if key[0].lower() in cls.aliases else key[0]
t = cls.aliases[key[1].lower()] if key[1].lower() in cls.aliases else key[1]
with scoped_session() as session:
return session.query(cls).filter(and_(cls.from_unit==f, cls.to_unit==t)).one().factor
else:
raise KeyError('Usage requires syntax Dimension["from_unit", "to_unit"]')
def test_unit_creation(self):
"""Test :func:`~exa.cms.unit.Dimension.create`."""
Length.create("xyz", "zyx", 1)
self.assertEqual(unit.units[('xyz', 'zyx')], 1)
self.assertEqual(unit.units[('zyx', 'xyz')], 1)
with scoped_session() as session:
session.query(Length).filter(Length.from_unit=="xyz").delete()
session.query(Length).filter(Length.from_unit=="zyx").delete()
def get_by_symbol(cls, symbol):
"""Get the value of a constant with the given symbol."""
if symbol.lower() in cls.aliases:
symbol = cls.aliases[symbol.lower()]
with scoped_session() as session:
return session.query(cls).filter(cls.symbol == symbol).one().value
def init_tutorial():
"""Create the tutorial notebook."""
fp = os.path.join(config['paths']['notebooks'], 'tutorial.ipynb')
with scoped_session() as session:
tutorial = File.from_path(fp)
session.add(tutorial)