slow.py

#!/bin/sh
"exec" "python" "-u" "--" "$0" "$@"


import os
import sys
import time


class ForceIOStream:
    def __init__(self, stream):
        self.stream = stream

    def write(self, data):
        self.stream.write(data)
        self.stream.flush()
        if not self.stream.isatty():
            os.fsync(self.stream.fileno())

    def __getattr__(self, attr):
        return getattr(self.stream, attr)


sys.stdout = ForceIOStream(sys.stdout)
sys.stderr = ForceIOStream(sys.stderr)

for i in xrange(20):
  print i
  time.sleep(1)