#!/usr/bin/env python
# ch4-6.py
from openeye.oechem import *
  
ifs = oemolistream()
ofs = oemolostream()
  
if (ifs.open("drugs.sdf.gz") == 1):
    if (ofs.open("drugs.oeb.gz") == 1):
        for mol in ifs.GetOEGraphMols():
            OEWriteMolecule(ofs, mol)
    else:
        sys.stderr.write("Unable to open output file\n")
else:
    sys.stderr.write("Unable to open input file\n")