This script lives in /sdf/group/lcls/ds/ana/tutorials/psana1_examples/dataAccess.py and demonstrates how to specify an experiment/run number and iterate over events.
from psana import *
ds = DataSource('exp=xpptut15:run=54:smd')
nevent = 0
for evt in ds.events():
nevent+=1
if nevent==3:
break
print(f'Processed {nevent} events.')
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