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For dynamics simulation in Python my basic workflow is something like this:

Initializing

psspy.case(case file converted.cnv)
psspy.rstr(dynamics file.snp)
psspy.strt(outfile=file to save.out)
psspy.run(tpause=time_before fault)

Applying fault

psspy.dist_bus_fault(faulted bus number)
psspy.run(tpause=time when the fault ends)

Clearing fault, tripping equipment and finishing simulation

psspy.dist_branch_trip(ibus=frombus, jbus=tobus, id=busid)
psspy.dist_machine_trip(ibus=<machine bus, id=machine id)
psspy.dist_clear_fault(1)
psspy.run(tpause=end time)

Extra: If you're using custom models, you'll also need to load the custom models:

psspy.dropmodellibrary(user_model.dll)
psspy.addmodellibrary(user_model.dll)

Chapter 4 in the API manual has tons of commands if you need something more specific.