fhand1=open('src.csv')
fout=open("new.txt", 'w')
fhand2=open('data.dat')
lines3=''
lines4=' >= '
for line in fhand1:
      lines=line.rstrip()
      lines=line.split(',',1)
      print lines
      for lines1 in fhand2:
           if lines1.startswith(lines[0]):
           myline=lines1.rstrip()
           lines3=myline+lines4+lines[1]
           print lines3
           elif not lines1.startswith(lines[0]):
                 continue

with open("src.csv") as t, open("data.dat") as v:
    while 1:
        try:
            print t.next(), v.next()
        except StopIteration:
            break