problema5

def findParassita(file,sequence):
# @string: stringa
# @sequence: stringa
  F= open(file,'rt')
  f= F.read()
  if (f.find(sequence)) != -1:
   g= f.find(sequence)
   start= f[:g].rfind('>')
   end= start + f[start:].find('\n')
   return f[start:end]
  else:
   print "parassita non trovato"