MiNiFi Dymo ExecuteScript

import codecs

def onTrigger(context, session):
  flow_file = session.get()
  if flow_file is not None:
    log.info('got flow file: %s' % flow_file.getAttribute('filename'))
    filename = flow_file.getAttribute('filename')
    counter = filename.split('_')[1].split('.')[0]
    log.info('counter is: %s' % counter)
    weight_file = open('/tmp/weight/weight_' + counter + '.txt')
    weight = weight_file.read()
    weight_file.close()
    log.info('Weight is: %s' % weight)
    flow_file.addAttribute("weight", weight)
    session.transfer(flow_file, REL_SUCCESS)                                                                                                                                                                                                         1,1           All