def _parse_quantity(quantity_str, expected_units, default_unit, unit_type):
try:
if default_unit:
quantity = Quantity.from_string_or_float(quantity_str,
default_unit)
else:
quantity = Quantity.from_string(quantity_str)
except ValueError:
raise ParseError(
"can't interpret {quantity_str!r} as a {unit_type}",
quantity_str=quantity_str,
unit_type=unit_type,
) from None
if quantity.unit not in expected_units:
raise ParseError(
lambda e:
f"can't interpret {e.quantity_str!r} as a {unit_type}, did you mean '{Quantity(e.quantity.value, did_you_mean(e.quantity.unit, e.expected_units))}'?",
quantity=quantity,
quantity_str=quantity_str,
expected_units=expected_units,
unit_type=unit_type,
)
return quantity
def parse_conc(x):
return Quantity.from_string_or_float(x, 'µg/µL')