While I was writing a simple stopwatch script in python I came across a few hurdles. If you print out a line and don't include the ending carriage return it buffers the output. Sometimes this isn't what you want, and you have to flush the output buffer.

sys.stdout.flush()

I also needed to figure out how to capture ctrl+c in python. If you hit ctrl+c while a python script is running you get a bunch of debug messages. Not what I wanted.

import signal
signal.signal(signal.SIGINT, sig_handle)

def sig_handle(signal,frame):
    print signal, "was handled!"