需要一些关于 Python 循环 and/or 重复函数的信息

Question

我是 python 的新手，我已经阅读、搜索、研究和执行过。我在寻找我正在尝试做的事情的答案时遇到问题。这是我所拥有的....

 # GPIO setup
GPIO.setmode(GPIO.BCM)
GPIO.setup(channel, GPIO.OUT)


def solenoid_on(pin):
    GPIO.output(pin, GPIO.HIGH)  # Turn solenoid on


def solenoid_off(pin):
    GPIO.output(pin, GPIO.LOW)  # Turn solenoid off

if __name__ == '__main__':

    try:
        solenoid_on(channel) #              |~ in this section, i would like to repeat X amount
        time.sleep(1)    # Sets lag time    |  of times, have a set number of "run time" say...
        solenoid_off(channel) #             |  150 times..or do i just copy and paste this block
        time.sleep(3)    # Sets run time    |  150 times? 

        print("DONE")

        GPIO.cleanup()

    except KeyboardInterrupt:
        GPIO.cleanup()

非常感谢您的帮助。

Answer 1

 if __name__ == '__main__':

try:
    for i in range(150):
        solenoid_on(channel) #              |~ in this section, i would like to repeat X amount
        time.sleep(1)    # Sets lag time    |  of times, have a set number of "run time" say...
        solenoid_off(channel) #             |  150 times..or do i just copy and paste this block
        time.sleep(3)    # Sets run time    |  150 times? 

        print("Iteration", i, " is done")

    GPIO.cleanup()

Answer 2

您可以试试下面的方法。 For 循环运行s 通过它 150 次。

如果您特别需要运行 X 次，请使用 for 循环

如果您需要它在 Y 发生之前一直工作（例如某些响应或时间限制），请使用 while 循环

不确定是否要在 for 循环中使用 try/except。

For循环

if __name__ == '__main__':

    try:
        for i in range(150):
            start = time.time()
            print('Turning Solenoid', i, 'On')
            solenoid_on(channel) 
            time.sleep(1)
            print('Turning Solenoid', i, 'Off')
            solenoid_off(channel)
            time.sleep(3)
            print('Completed Solenoid', i, 'in', time.time()-start, 'seconds\n\n')

        GPIO.cleanup()

    except KeyboardInterrupt:
        GPIO.cleanup()

While 循环

if __name__ == '__main__':

    #minutes elapsed    
    elapsed = 0
    start = time.time()
    while elapsed < 10:
        try:
            print('Turning Solenoid', i, 'On')
            solenoid_on(channel) 
            time.sleep(1)
            print('Turning Solenoid', i, 'Off')
            solenoid_off(channel)
            time.sleep(3)
            print('Completed Solenoid', i, 'in', time.time()-start, 'seconds\n\n')

            GPIO.cleanup()

        except KeyboardInterrupt:
            GPIO.cleanup()

        # set elapsed minutes
        elapsed = (time.time()-start)/60
        print('Elapsed time...', elapsed, 'minutes')

需要一些关于 Python 循环 and/or 重复函数的信息

Need some information with Python loop and/or repeat functions

python

loops

repeat