Can anyone Pythonize this lexical algorithm?

[ShashiGowda]

I am writing a package manager and stuck unable to write the version
sorting function the algorithm is here 
http://www.linux.gr/cgi-bin/man/man2html?deb-version+5
and all other info is also in it please tell me how to do lexical
comparision in python it'll be cool if you just write the code!
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