I've marked PEP 272: "API for Block Encryption Algorithms v1.0" as final, adding the 1.0 version designation just in case there's a 1.1 or 2.0 some day.
The HTML version is at http://www.python.org/peps/pep-0272.html
The only changes from the previous version posted on April 17th are minor and purely editorial, so the full text won't be included in this posting.
--amk (www.amk.ca) I'm afraid we have no time for codes and manners. -- The Doctor, in "The Edge of Destruction"