Can you recommend any OS, ready-to-go, well-documented and not dead MT940 format parser for Python?
I only manage to find this python project: https://github.com/headcr4sh/django-banking Maybe you can extend/update the above project for your own purpose. The code is quite easy to read.
If you don't mind using Java, there's one up to date project that could parse/create any swift message easily:
http://sourceforge.net/projects/wife/
Code sample:
their website: http://www.prowidesoftware.com/core.jsp