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    <p>The <a href="http://docs.python.org/library/signal.html?highlight=signal#signal.alarm" rel="noreferrer">signal.alarm</a> function, on which @jer's recommended solution is based, is unfortunately Unix-only. If you need a cross-platform or Windows-specific solution, you can base it on <a href="http://docs.python.org/library/threading.html?#timer-objects" rel="noreferrer">threading.Timer</a> instead, using <a href="http://docs.python.org/library/thread.html?highlight=interrupt_main#thread.interrupt_main" rel="noreferrer">thread.interrupt_main</a> to send a <code>KeyboardInterrupt</code> to the main thread from the timer thread. I.e.:</p> <pre><code>import thread import threading def raw_input_with_timeout(prompt, timeout=30.0): print prompt, timer = threading.Timer(timeout, thread.interrupt_main) astring = None try: timer.start() astring = raw_input(prompt) except KeyboardInterrupt: pass timer.cancel() return astring </code></pre> <p>this will return None whether the 30 seconds time out or the user explicitly decides to hit control-C to give up on inputting anything, but it seems OK to treat the two cases in the same way (if you need to distinguish, you could use for the timer a function of your own that, before interrupting the main thread, records somewhere the fact that a timeout <em>has</em> happened, and in your handler for <code>KeyboardInterrupt</code> access that "somewhere" to discriminate which of the two cases occurred).</p> <p><strong>Edit</strong>: I could have sworn this was working but I must have been wrong -- the code above omits the obviously-needed <code>timer.start()</code>, <em>and</em> even with it I can't make it work any more. <code>select.select</code> would be the obvious other thing to try but it won't work on a "normal file" (including stdin) in Windows -- in Unix it works on all files, in Windows, only on sockets.</p> <p>So I don't know how to do a cross-platform "raw input with timeout". A windows-specific one can be constructed with a tight loop polling <a href="http://docs.python.org/library/msvcrt.html?highlight=msvcrt#msvcrt.kbhit" rel="noreferrer">msvcrt.kbhit</a>, performing a <code>msvcrt.getche</code> (and checking if it's a return to indicate the output's done, in which case it breaks out of the loop, otherwise accumulates and keeps waiting) and checking the time to time out if needed. I cannot test because I have no Windows machine (they're all Macs and Linux ones), but here the <strong>untested code</strong> I would suggest:</p> <pre><code>import msvcrt import time def raw_input_with_timeout(prompt, timeout=30.0): print prompt, finishat = time.time() + timeout result = [] while True: if msvcrt.kbhit(): result.append(msvcrt.getche()) if result[-1] == '\r': # or \n, whatever Win returns;-) return ''.join(result) time.sleep(0.1) # just to yield to other processes/threads else: if time.time() &gt; finishat: return None </code></pre> <p>The OP in a comment says he does not want to <code>return None</code> upon timeout, but what's the alternative? Raising an exception? Returning a different default value? Whatever alternative he wants he can clearly put it in place of my <code>return None</code>;-).</p> <p>If you don't want to time out just because the user is typing <em>slowly</em> (as opposed to, not typing at all!-), you could recompute finishat after every successful character input.</p>
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    1. POHow to set time limit on raw_input
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    1. COhmm, I upvoted this, but now that I test it, it doesn't seem to work :s. You still have to press Enter (python 2.6.5 on Ubuntu Linux).
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    2. COyeah. im testing your code right now, and i set it to 5 seconds, but like catchmeifyoutry said, you still have to wait until enter is pressed
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    3. COthere is also an interesting note in the python thread documentation: Caveat: Threads interact strangely with interrupts: the KeyboardInterrupt exception will be received by an arbitrary thread. (When the signal module is available, interrupts always go to the main thread.)
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