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from __future__ import absolute_import, print_function
from .altwcs import *
from .hstwcs import HSTWCS
def help():
doc = """ \
1. Using a `astropy.io.fits.HDUList` object and an extension number \n
Example:\n
from astropy.io improt fits
fobj = fits.open('some_file.fits')\n
w = wcsutil.HSTWCS(fobj, 3)\n\n
2. Create an HSTWCS object using a qualified file name. \n
Example:\n
w = wcsutil.HSTWCS('j9irw4b1q_flt.fits[sci,1]')\n\n
3. Create an HSTWCS object using a file name and an extension number. \n
Example:\n
w = wcsutil.HSTWCS('j9irw4b1q_flt.fits', ext=2)\n\n
4. Create an HSTWCS object from WCS with key 'O'.\n
Example:\n
w = wcsutil.HSTWCS('j9irw4b1q_flt.fits', ext=2, wcskey='O')\n\n
5. Create a template HSTWCS object for a DEFAULT object.\n
Example:\n
w = wcsutil.HSTWCS(instrument='DEFAULT')\n\n
"""
print('How to create an HSTWCS object:\n\n')
print(doc)
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