Finding minimal Python version needed to run a script?

[Dinu Gherman]

Hello, 

here are some meta-programming questions...

I wonder if there is already some tool to find out what
minimal release version of Python is needed to run a given 
script?

Also, it would be interesting to list specific features used 
in a script that require a certain release.

Would this kind of thing be easy/possible to write using the 
compiler module?

Meta-question: does such a tool always need to be written 
in the latest release of Python itself?

Regards,

Dinu

-- 
Dinu C. Gherman
ReportLab Consultant - http://www.reportlab.com
................................................................
"The only possible values [for quality] are 'excellent' and 'in-
sanely excellent', depending on whether lives are at stake or 
not. Otherwise you don't enjoy your work, you don't work well, 
and the project goes down the drain." 
                    (Kent Beck, "Extreme Programming Explained")