How do I split one file into two files using Python? [closed]

Answer 1

A more efficient answer which will handle large files and consume a limited amount of memory..

inp = open('inputfile')
out = open('outfile1', 'w')
for line in inp:
  if line == "Sentinel text\n":
    out.close()
    out = open('outfile2', 'w')
  else:
    out.write(line)
out.close()
inp.close()