import string

sumsf=open('sums.txt')
donef=open('done.txt')
newf=open('new.txt','w')
dl=[]
for line in donef.readlines():
  line=string.strip(line)
  dl.append(line)
for line in sumsf.readlines():
  line=string.strip(line)
  parts=string.split(line, ',')
  sum=parts[0]
  file=parts[1]
  if not sum in dl:
    newf.write(line+'\n')