code: def getadistus(data, commdct):
      
      objkey = "ZoneHVAC:AirDistributionUnit".upper()
      objindex = data.dtls.index(objkey)
      objcomm = commdct[objindex]
      adistutypefield = "Air Terminal Object Type"
      ifield = getfieldindex(data, commdct, objkey, adistutypefield)
      adistus = objcomm[ifield]['key']
      return adistus
docs: docstring for fname