Is there a Python library that packs binary data into one file?

[Jacob H]

Hello all,

Today I began writing a utility script that takes given binary files
and puts them all into one datafile. My idea is to be able to access
any binary data I want by indexing the datafile, e.g.
wanted_image_data = datafileobj[IMAGE_DATA]. The purpose is to hide
external image files from the user in a simple game I'm writing.

Though I have a good idea of how to implement this, before I begin I
am curious to know if some Python master out there has already come
out with a library that does the same. Anyone? :)