[Tutor] how to get blank value

[amrita at iisermohali.ac.in]

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 =  CA =  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,

I tried in this way:
import re
expr = re.compile("C = None")
f = open("helix.dat")
for line in f:
    if expr.search(line):
       print line

but i am not getting the desired output.


Amrita Kumari
Research Fellow
IISER Mohali
Chandigarh
INDIA