valid = False
print >> ofile, "Invalid CAS# in record: '%s'" % cas
else : # cas = 'N...N-NN-N:X%,N...N-NN-N:Y%,...'
for casterm in cas.split(CAS_DELIM) : # casterm = 'N...N-NN-N:X%'
c = casterm.split(PERCENT_DELIM)[0] # c = 'N...N-NN-N'
valid = False
print >> ofile, "Invalid CAS# in record: '%s'" % cas
else : # cas = 'N...N-NN-N:X%,N...N-NN-N:Y%,...'
for casterm in cas.split(CAS_DELIM) : # casterm = 'N...N-NN-N:X%'
c = casterm.split(PERCENT_DELIM)[0] # c = 'N...N-NN-N'