extend_bit_flag_map

astropy.nddata.bitmask.extend_bit_flag_map(cls_name, base_cls=<BitFlagNameMap 'BitFlagNameMap'>, **kwargs)

A convenience function for creating bit flags maps by subclassing an existing map and adding additional flags supplied as keyword arguments.

Parameters:

cls_namestr

Class name of the bit flag map to be created.

base_clsBitFlagNameMap, optional

Base class for the new bit flag map.

**kwargsint

Each supplied keyword argument will be used to define bit flag names in the new map. In addition to bit flag names, __version__ is allowed to indicate the version of the newly created map.

Examples

>>> from astropy.nddata.bitmask import extend_bit_flag_map
>>> ST_DQ = extend_bit_flag_map('ST_DQ', __version__='1.0.0', CR=1, CLOUDY=4, RAINY=8)
>>> ST_CAM1_DQ = extend_bit_flag_map('ST_CAM1_DQ', ST_DQ, HOT=16, DEAD=32)
>>> ST_CAM1_DQ['HOT']  # <-- Access flags as dictionary keys
16
>>> ST_CAM1_DQ.HOT  # <-- Access flags as class attributes
16