Question

假设您要在程序结尾处从终端询问用户一些信息。但是，在程序运行期间，用户按下了Enter键。

import sys
import click
import time
print("Hit enter now to see this 'problem'")
time.sleep(1)
# Hit enter now while the program sleeps!
a=input("Do you want to delete something that is really bad to delete? [Y|n]")
if a.lower()!="n":
    print("\nNO! YOU DELETED IT!")

当然，删除具有默认响应的内容是愚蠢的，我不这样做。但是，令人讨厌的是，我（用户）有时会按Enter键，而默认设置是这样。

我实际上是在使用click来读取输入内容。因此，在单击执行之前，我需要一个预防性命令；

import sys
import click
import time
print("Hit enter now to see this 'problem'")
time.sleep(1)
# Hit enter now while the program sleeps!
# Clear stdin here somehow.
sys.stdin.flush() # <- doesn't work though 
a=input("Do you want to delete something that is really bad to delete? [Y|n]")
if a.lower()!="n":
    print("\nNO! YOU DELETED IT!")

我正在使用Linux（Ubuntu 16.04和Mac OS）。

有什么想法吗？

Answer 1

结果是我需要termios.tcflush()和termios.TCIFLUSH来完成要求的工作：

import sys
from termios import tcflush, TCIFLUSH
import click
import time
print("Hit enter now to see this 'problem'")
time.sleep(1)# Hit enter while it sleeps!
tcflush(sys.stdin, TCIFLUSH)
# Discards queued data on file descriptor 'stdin'.
# TCIFLUSH specifies that it's only the input queue.
# Use TCIOFLUSH if you also want to discard output queue.

a=input("Do you want to delete something that is really bad to delete? [Y|n]")
if a.lower()!="n":
    print("\nNO! YOU DELETED IT!")
else:
    print("Phew. It's not deleted!")

不要从sys.stdin中读取较早的输入

1 个答案: