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# extend_bit_flag_map

astropy.nddata.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_name `python:str`

      Class name of the bit flag map to be created.

    base_cls `BitFlagNameMap`, optional

      Base class for the new bit flag map.

    **kwargs `python:int`

      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