Puppet users - Apr 2014 - detect python|ruby|foo-package installed

Is there a way in puppet to detect what version of python or ruby, or for 
that matter, any package which is installed?

For instance:
if python_version > x:
    do something
else
    do something else

It looks liek versioncmp is what I want, but I don't know how to get the 
version.
Maybe do some sort of exec that gets this version?

Sorry if this a newb question,
Thanks

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