查看“Astropy”的源代码

== astropy.io.fits ==
[http://docs.astropy.org/en/stable/io/fits/]

 >>> hdulist = fits.open('input.fits')
 >>> hdulist.info()

*each element of an HDUList is an HDU object with .header and .data attributes, which can be used to access the header and data portions of the HDU.
 >>> hdulist[0].header['targname']

*To see the entire header as it appears in the FITS file (with the END card and padding stripped), simply enter the header object by itself, or print(repr(header)):
*It’s also possible to view a slice of the header:
 >>> header[:2]
*Another way to either update an existing card or append a new one is to use the Header.set() method:
 >>> prihdr.set('observer', 'Edwin Hubble')

==宇宙学==
*#从红移到年龄
 >>>from astropy.cosmology import FlatLambdaCDM 
 >>>cosmo = FlatLambdaCDM(H0=70, Om0=0.3)

*从年龄到红移
 >>> import astropy.units as u
 >>> from astropy.cosmology import  z_at_value
 >>> z_at_value(cosmos.age, 2 * u.Gyr)