AMOS (A Modular Open-Source Assembler) defines a standard message format for describing DNA sequence assemblies. It has a Perl module for reading these assemblies, but no Python module.
Shock! This must be rectified, forthwith!
I am currently using this module to import Newbler assemblies of 454 data into AMOS. The quality data is thoroughly b0rked. If anyone has any experience with this, please contact me.