Re: asynchronous alarm
Paul Rubin wrote:
a = Event()
Thread(target=f, args=(a,)).start()
raw_input('hit return when done: ')
a.set()
Simple and elegant.
Thank you.
Alan
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asynchronous alarm
Goal: turn off an audible alarm without
terminating the program. For example,
suppose a console program is running::
while True:
sys.stdout.write('\a')
sys.stdout.flush()
time.sleep(0.5)
I want to add code to allow me to turn off
this alarm and then interact with the
program in its new state (which the alarm
alerts me to).
Question: how best to do this mostly simply
in a console application and in a Tkinter application?
I realize this must be a standard problem so that there
is a good standard answer. Here are some naive solutions
that occured to me.
Solution C1 (console): poll keyboard inside the loop.
E.g., URL:http://effbot.org/librarybook/msvcrt.htm
Problem: no platform independent way to do this?
Solution C2 (console): handle KeyboardInterrupt.
An ugly hack. But works fine.
Solution C3 (console): start alarm in one thread
and wait for raw_input. (Should that be in another
thread? It does not seem to matter.)
This seems plausible, but I know nothing about threads
except that nonprogrammers tend to make mistakes
with them, so I hesitate.
Solution G1 (gui): start alarm in a thread but
include a test for a variable that can be set
by a button push? (Sounds plausible etc.)
Solution G2 (gui): start alarm but
somehow let Tkinter listen for an event
without programming any threads. Possible??
Thanks,
Alan
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Re: asynchronous alarm
Alan Isaac [EMAIL PROTECTED] writes:
while True:
sys.stdout.write('\a')
sys.stdout.flush()
time.sleep(0.5)
I want to add code to allow me to turn off this alarm and then
interact with the program in its new state (which the alarm alerts
me to).
Question: how best to do this mostly simply in a console application
and in a Tkinter application?
You'd usually use another thread to tell the loop when to exit,
or run the loop itself in another thread:
import sys,time
from threading import Event, Thread
def f(event):
while not event.isSet():
sys.stdout.write('\a')
sys.stdout.flush()
time.sleep(0.5)
a = Event()
Thread(target=f, args=(a,)).start()
raw_input('hit return when done: ')
a.set()
see the docs for the threading module, to make sense of this.
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