在有限的时间内用Python要求用户输入 [英] Asking a user for input only for a limited amount of time in python
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问题描述
我正在处理的程序需要暂停并要求用户输入,如果没有输入,请继续执行该程序.我认为它看起来像这样:
The program I am working on needs to pause and ask the user for input and if there is none, move on with the program. I think it would look something like this:
import time
...[code to run before break]...
if input in time.sleep(5):
[break out of normal code]
else:
[return to normal code]
[code to run after break]...
有什么想法吗?
当我询问但我正在运行Windows(8.1)时,没有想到这一点.
Didn't think about this when I asked but I am running Windows (8.1).
推荐答案
是一种简单快捷的hack,但有效.以下内容将等待用户输入5秒钟或直到收到输入为止,以先到者为准.
Bit of a quick-and-dirty hack, but effective. The following waits for user input for 5 seconds or until input is received, whichever happens first.
from datetime import datetime, timedelta
import os
import signal
import threading
import time
waiting = False
def wait_and_kill(timeout):
elapsed = timedelta(0)
while elapsed.total_seconds() < timeout and waiting:
start = datetime.now()
time.sleep(0.1)
elapsed += datetime.now() - start
if waiting:
os.kill(os.getpid(), signal.SIGINT)
try:
t = threading.Thread(target=wait_and_kill, args=(5,))
waiting = True
t.start()
raw = raw_input('> ')
waiting = False
except KeyboardInterrupt:
pass
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