def to_tree(cls, node, ctx):
from astropy.units import Unit, UnitBase
if isinstance(node, six.string_types):
node = Unit(node, format='vounit', parse_strict='warn')
if isinstance(node, UnitBase):
return node.to_string(format='vounit')
raise TypeError("'{0}' is not a valid unit".format(node))
def units_to_fits(unit):
""" Convert an astropy unit to a FITS format string.
uses the to_string() method built-in to astropy Unit()
Notes
-----
The output will be the format defined in the FITS standard:
http://fits.gsfc.nasa.gov/fits_standard.html
A roundtrip from fits_to_units -> units_to_fits may not return
the original string, as people often don't follow the standard.
"""
if unit is None:
unit = Unit('')
return unit.to_string("fits").upper()
def units_to_fits(unit):
""" Convert an astropy unit to a FITS format string.
uses the to_string() method built-in to astropy Unit()
Notes
-----
The output will be the format defined in the FITS standard:
http://fits.gsfc.nasa.gov/fits_standard.html
A roundtrip from fits_to_units -> units_to_fits may not return
the original string, as people often don't follow the standard.
"""
if unit is None:
unit = Unit('')
return unit.to_string("fits").upper()
def to_tree(cls, node, ctx):
if isinstance(node, six.string_types):
node = Unit(node, format='vounit', parse_strict='warn')
if isinstance(node, UnitBase):
return node.to_string(format='vounit')
raise TypeError(f"'{node}' is not a valid unit")
def to_tree(cls, node, ctx):
if isinstance(node, six.string_types):
node = Unit(node, format='vounit', parse_strict='warn')
if isinstance(node, UnitBase):
return node.to_string(format='vounit')
raise TypeError("'{0}' is not a valid unit".format(node))