ccdproc works only with astropy version 2.0 or later.
ccdproc package provides:
An image class,
CCDData, that includes an uncertainty for the data, units and methods for performing arithmetic with images including the propagation of uncertainties.
A set of functions performing common CCD data reduction steps (e.g. dark subtraction, flat field correction) with a flexible mechanism for logging reduction steps in the image metadata.
A function for reprojecting an image onto another WCS, useful for stacking science images. The actual reprojection is done by the reproject package.
A class for combining and/or clipping images,
Combiner, and associated functions.
ImageFileCollection, for working with a directory of images.