Hi, I have a file having lines:-
48 ALA H = 8.33 N = 120.77 CA = 55.18 HA = 4.12 C = 181.50 104 ALA H = 7.70 N = 121.21 CA = 54.32 HA = 4.21 C = 85 ALA H = 8.60 N = CA = HA = 4.65 C = Now i want to make two another file in which i want to put those lines for which C is missing and another one for which N,CA and C all are missing, 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. Amrita Kumari Research Fellow IISER Mohali Chandigarh INDIA _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor