def convert_cfunits(from_value,
from_unit,
wanted_unit=None,
suppress_unit=False):
""" Use the cfunits-python package to handle the interaction with udunits2 """
try:
from cfunits import Units
except ImportError:
raise Exception("cfunits option relies on cfunits-python package")
ZERO = False
if float(from_value) == 0:
# special Zero handling
if from_unit != '1':
warnings.warn("""Found a 0, udunits2 breaks,
so we are assuming that this is not a non-zero based conversion like temperature"""
)
ZERO = True
from_value = 1.
if wanted_unit:
return Units.conform(from_value, Units(from_unit), Units(wanted_unit))
out = Units(" ".join((str(from_value), from_unit))).format()
split_out = out.split(' ')
if len(split_out) == 1:
out = (1., split_out[0])
else:
if ZERO:
out = (0.0, split_out[1])
else:
out = (float(split_out[0]), split_out[1])
if suppress_unit:
return out[0]
return out
