python: edit ISO file directly

Question

1. Is it possible to take an ISO file and edit a file in it directly, i.e. not by unpacking it, changing the file, and repacking it?
2. It is possible to do 1. from

Answer 1

1. Of course, as with any file.

2. It can be done with open/read/write/seek/tell/close operations on a file. Pack/unpack the data with struct/ctypes. It would require serious knowledge of the contents of ISO, but I presume you already know what to do. If you're lucky you can try using mmap - the interface to file contents string-like.