[Python-ideas] Code version evolver

[francismb]

Hi,
I would like to discuss on the idea of a code (minor) version
evolver/re-writer (or at least a change indicator). Let's see one wants
to add a feature on the next version and some small grammar change is
needed, then the script upgrades/evolves first the current code and then
the new version can be installed/used.

Something like:

>> new-code = python-next('3.7', current-code)
>> is-python-code('3.8', new-code)
>> True


How hard is that? or what is possible and what not?
where should it happen? on the installer?

Thanks in advance!
--francis