NDIOMixin

class astropy.nddata.NDIOMixin

Bases: object

Mixin class to connect NDData to the astropy input/output registry.

This mixin adds two methods to its subclasses, read and write.

Attributes Summary

read	Read and parse gridded N-dimensional data and return as an NDData-derived object.
write	Write this CCDData object out in the specified format.

Attributes Documentation

read

Read and parse gridded N-dimensional data and return as an NDData-derived object.

This function provides the NDDataBase interface to the astropy unified I/O layer. This allows easily reading a file in the supported data formats, for example:

>>> from astropy.nddata import CCDData
>>> dat = CCDData.read('image.fits')

Get help on the available readers for CCDData using the``help()`` method:

>>> CCDData.read.help()  # Get help reading CCDData and list supported formats
>>> CCDData.read.help('fits')  # Get detailed help on CCDData FITS reader
>>> CCDData.read.list_formats()  # Print list of available formats

See also:

• https://docs.astropy.org/en/stable/nddata

• https://docs.astropy.org/en/stable/io/unified.html

Parameters:

*argspython:tuple, optional

Positional arguments passed through to data reader. If supplied the first argument is the input filename.

formatpython:str, optional

File format specifier.

cachebool, optional

Caching behavior if file is a URL.

**kwargspython:dict, optional

Keyword arguments passed through to data reader.

Returns:

outNDData subclass

NDData-basd object corresponding to file contents

write

Write this CCDData object out in the specified format.

This function provides the NDData interface to the astropy unified I/O layer. This allows easily writing a file in many supported data formats using syntax such as:

>>> from astropy.nddata import CCDData
>>> dat = CCDData(np.zeros((12, 12)), unit='adu')  # 12x12 image of zeros
>>> dat.write('zeros.fits')

Get help on the available writers for CCDData using the``help()`` method:

>>> CCDData.write.help()  # Get help writing CCDData and list supported formats
>>> CCDData.write.help('fits')  # Get detailed help on CCDData FITS writer
>>> CCDData.write.list_formats()  # Print list of available formats

See also:

• https://docs.astropy.org/en/stable/nddata

• https://docs.astropy.org/en/stable/io/unified.html

Parameters:

*argspython:tuple, optional

Positional arguments passed through to data writer. If supplied the first argument is the output filename.

formatpython:str, optional

File format specifier.

**kwargspython:dict, optional

Keyword arguments passed through to data writer.