<amr...@iisermohali.ac.in> wrote
With these commands:-

import re
f = open('chem.txt')
for line in f:
    if re.search('C = ',line):
       print line

I am getting those lines for which C value is there but how to get those
one for which it doesn't have any value, i did google search but still i
am not getting.

Don;t do a Google search, just read the re documentation, including the HowTo, looking for how to detect the end of a line.

Alan G.

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