Decoupling the version of the file from the name of the module.

[bobueland at yahoo.com]

I'm a newbie experimenting with Python. I want to incrementally develop
a module called 'circle'. The problem is now that the file name is used
for two purposes. To keep track of the version number and as the name
for the module. So when I develop the first version of my file I have
to call it circle_a.py. The name of the module then automatically
becomes circle_a. But when I develop the next increment and call my
file circle_b.py the module name changes as well.

Basically I want to decouple the version of my file from the name of
the module.

Is there a *simple* way out of this dilemma.