Extracting edge information from ".gml" file

Hello friends,

I am working with 'networkx". I am using .gml file for storing my node and egde information of Social network graph. My supervisior was in need of edge information of my Social network graph. So, i have written this script for him.

#!/usr/bin/python
#Filename:trim.py
#open edgelist file

f=open("edge_new.gml","r")
#open destination file
h=open("final1.txt","w")
c=0
while True:
    l=f.readline()
    l1=len(l)
    if l1==0:
        break
    if l1 > 9:
        if l[2]=='s' and l[3]=='o':
            i=9
            while True:
                if l[i]=="\n":
                    break
                h.write(l[i])
                i=i+1
            h.write(" ")
        if l[2]=='t' and l[3]=='a':
           i=9
           while True:
               if l[i]=="\n":
                   break
               h.write(l[i])
               i=i+1
           h.write("\n")
f.close()
h.close()

Since, Python uses whitespace indentation. An increase in indentation comes after certain statements(i.e. Control Statement), a decrease in indentation signifies the end of the current block. So, it is possible that above code gives aome indentation error.Any one can download code from attachment of this post