继续执行代码而不中断循环函数的输出

Question

我有一个while以厘秒为单位的循环计数并打印current_stepvar，总是在同一行。我想跑步，例如，x = Truewhile x is True:    pass #printing timer to CLI hereprint('this is more code running while the timer is still running')input('Press enter to stop the timer')x = False#When x becomes False, I want the while loop to terminate我知道这一定涉及子流程或类似的东西，但我不知道要为学习解决这个问题指明自己的方向。这是供参考的功能：def timer(stawt, stahp, step, time_step):    from time import sleep    stawt = int(stawt)    stahp = int(stahp)    if stahp < 1:        stahp = 1    elif stahp > 1000:        stahp = 1000    stahp = stahp * 100 + 1    titerator = iter(range(stawt, stahp, step))    while True:        try:            current_step = str(next(titerator))            if int(current_step) < 99:                final_time = '0' + current_step[:0] + '.' + current_step[0:] + 's'                print('\r' + final_time, end='')            elif int(current_step) < 999:                final_time = current_step[:1] + '.' + current_step[1:] + 's'                print('\r' + final_time, end='')            elif int(current_step) < 9999:                final_time = current_step[:2] + '.' + current_step[2:] + 's'                print('\r' + final_time, end='')            else:                final_time = current_step[:3] + '.' + current_step[3:] + 's'                print('\r' + final_time, end='')            sleep(time_step)        except:            print(); break    seconds = int((int(current_step) / 100) % 60)    minutes = int((int(current_step) / 100) // 60)    if minutes < 1:        return ''    else:        final_time_human = str(minutes) + 'm ' + str(round(seconds)) + 's'        print(final_time_human + '\n')def MAIN():    count_to = float(input('Enter max number of seconds to count:\n'))    print()    timer(0, count_to, 1, 0.01)MAIN()

Answer 1

你需要使用线程。

import threading

x = True

def thread_function():

    while x is True:

        pass #printing timer to CLI here

threading.Thread(target=thread_function).start()

# Continue with the other steps you want to take

# ...

# This will terminate the timer loop

x = False

Python 线程文档：https ://docs.python.org/3/library/threading.html

如果您想始终在同一行打印时间，则需要控制终端光标。

Answer 2

我已经开始工作了。这是他们改编成我的脚本的答案：

import threading

from os import system

timer_thread = None

def timer(stawt, stahp, step, time_step):

    from time import sleep

    global run_timer

    stawt = int(stawt)

    stahp = int(stahp)

    if stahp < 1:

        print('Sorry, I limit min count to 1 second!\n')

        stahp = 1

    elif stahp > 1000:

        print('Sorry, I limit max count to 1000 seconds!\n')

        stahp = 1000

    else:

        print()

    stahp = stahp * 100 + 1

    titerator = iter(range(stawt, stahp, step))

    def print_time():

        while run_timer is True:

            try:

                current_step = str(next(titerator))

                if int(current_step) < 99:

                    final_time = '0' + current_step[:0] + '.' + current_step[0:] + 's'

                    print('\r' + final_time, end='')

                elif int(current_step) < 999:

                    final_time = current_step[:1] + '.' + current_step[1:] + 's'

                    print('\r' + final_time, end='')

                elif int(current_step) < 9999:

                    final_time = current_step[:2] + '.' + current_step[2:] + 's'

                    print('\r' + final_time, end='')

                else:

                    final_time = current_step[:3] + '.' + current_step[3:] + 's'

                    print('\r' + final_time, end='')

                sleep(time_step)

            except:

                break

        seconds = int((int(current_step) / 100) % 60)

        minutes = int((int(current_step) / 100) // 60)

        if minutes < 1:

            return ''

        else:

            final_time_human = str(minutes) + 'm ' + str(round(seconds)) + 's'

            print('\n' + final_time_human)

    print_time()

def _init_timer():

    global run_timer; run_timer = True

    global timer_thread

    print('Enter max number of seconds to count: ', end='')

    count_to = float(input())

    timer_thread = threading.Thread(target=timer, args=(0, count_to, 1, 0.01))

    timer_thread.start()

    print('\rPress enter to stop the timer:')

    usr_input = input(); run_timer = False

system('clear')

_init_timer()

timer_thread.join()

print('\nGoodbye!')