在不中断循环功能输出的情况下继续执行代码

Question

我有一个以厘米为单位的while循环，并始终在同一行上打印current_step var。

例如，我想跑步

x = True

while x is True:
    pass #printing timer to CLI here

print('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

我知道这必须涉及子流程或类似的事物，但我不知道要为解决该问题而学习的方向。

这里是供参考的功能：

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

您需要使用线程。

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

如果要始终在同一行上打印时间，则需要控制终端光标。欲了解更多信息，请结帐：How can move terminal cursor in Python?