No need to search - and in fact you can swap the IronPython engine for the new one and most code will work fine, and do so in bulk. This thread and the linked file(s) should help there. Updating python node in multiple scripts - #15 by jacob.small
Once upgraded just run the test and save those which don’t finish correctly in the ‘to update’ directory, and those which run without error in the ‘ready for release’ directory. Once testing is done update the failures in the to upgrade folder, saving them in the ‘ready for release’ directory when done. Once the ‘to upgrade’ folder is sufficiently emptied deploy to production and move onto the next task. 