The old way of just running a python script as an alert action was deprecated a while back.  It was a really simple, "run script and here's the search data."  That way is old and busted...so it is not around anymore.   The new hotness is Custom Alert Actions.  You can create one that runs your python.  There's some more setup/configuration so it is registered with the system and more effort goes into packaging it up as an official configuration in Splunk (official as in you made it for your environment...). Here is a previous discussion on this topic, too. ... View more