[Python-Dev] Release cycle question

[Ivano]

Hello everyone.
I'm writing to ask if Python uses a "fixed" release
time or if it depends strongly on something else.
In example, Blender does and since I'm diving
into Python because I would like to extend it, I 
would like to know if my work will have a default
lifetime or not.
By the way, Python 3 changed the game AFAIK,
will another major change come short?
Thanks in advance for any help.

Bye, Ivano.