如何创建一个不停止程序等待用户输入的命令行界面？

Question

我正在用 python 编写一个程序，它要求程序在后台不断运行，用户可以随时键入以暂停或结束程序。

到目前为止，我只能让程序完全停止并等待用户输入内容。

uInput = ""

counter = 3

while uInput != "password" and counter >= 0:
    uInput = input

    if uInput != "password":
        print("Incorrect Password.", counter, "tries remaining.")
        counter -= 1

输入语句完全冻结程序，直到用户按下回车键。在等待用户输入内容时，是否可以让程序运行，例如计时器或只是另一个程序？任何教程或提示都会有所帮助。

Answer 1

为此使用时间模块和线程模块。 代码：

from threading import Thread
import time

uInput = ""

counter = 3

thread_running = True


def passwordInputting():
    global counter
    start_time = time.time()
    while time.time() - start_time <= 10:
        uInput = input()
        if uInput != "password":
            print("Incorrect Password.", counter, "tries remaining.")
            counter -= 1
                                
        else:
            # code for if password is correct
            break

def passwordTimer():

    global thread_running
    global counter

    start_time = time.time()

    # run this while there is no input or user is inputting
    while thread_running:
        time.sleep(0.1)
        if time.time() - start_time >= 10:
            if uInput == "password":
                continue
            else:
                if counter > 0:
                    print("Incorrect Password.", counter, "tries remaining.")
                    counter -= 1
                    start_time = time.time() + 10
                    
                else:
                    # code for when no more tries left
                    break
                
timerThread = Thread(target=passwordTimer)
inputThread = Thread(target=passwordInputting)

timerThread.start()
inputThread.start()

inputThread.join() # interpreter will wait until your process get completed or terminated
thread_running = False

如果您想了解更多关于线程自己的信息，请看这里：https://realpython.com/intro-to-python-threading/