quick/dirty stdin line counter in python

per.py

#!/usr/bin/env python
 
import sys, time, select, signal
 
try:    window = int(sys.argv[1])
except: print 'usage: %s <window>' % sys.argv[0]; sys.exit(1)
a_time, b_time = long( time.time() ), 0
count          = 0
 
def ctrlc(signum, frame): sys.exit(0)
signal.signal(signal.SIGINT, ctrlc)
 
while not sys.stdin.closed:
    ready = select.select([sys.stdin], [], [], window)
    if ready[0]:
        l = sys.stdin.readline()
        if not l: break
        count += 1
    b_time = long( time.time() )
    if (b_time-a_time) >= window:
        print count
        sys.stdout.flush()
        count, a_time = 0, b_time