• match returns a pathset stream,
• a pathset returns a path stream,
• a path returns an atom stream,
• all stream iterators need explicit management.

Use list attributes to simpify everything:

  from daylight import Smiles, Smarts

  pat = Smarts.compile("CC[N,C]")
  mol = Smiles.smilin("OCCCN")  # made-up molecule
  paths = pat.match(mol)
  for path in paths:
    for atom in path.atoms:
      print atom.symbol,
    print