Question

在我展示代码之前，先介绍一下我正在研究的项目。我目前正在开发一个Python脚本，它将在Raspberry Pi上运行，以便从我地下室的污水泵中监控浮动开关。此代码将检查污水泵是否不符合以下两个标准：

如果开关打开超过三分钟
如果开关在三分钟内开启和关闭超过10次

我没有完成剩下的代码，但这就是我所拥有的：

import time

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.IN)
floatSwitch = GPIO.input(17)

import smtplib

running = True
log = open("sumpPumpLog.txt", "r+")
startTime = time.time()


def elapsedTime():
    """This function checks how much time
    has elapsed since the timer has started"""
    endtime = time.time()
    elapsed = endtime - starttime
    return elapsed


def sendEmail(*msg):
    """This function sends an email to selected recipients with a custom
    message as well as the log file attached."""
    #enter the code that sends an email to the family with the log attached

    fromaddr = 'from@email.com'
    toaddrs = [to@email.com']
    msg = """Please see the Pi and the data log file for more details."""

    # Credentials (if needed)
    username = 'my_username'
    password = 'my_password'

    msg.attached()

    # The actual mail send
    server = smtplib.SMTP('smtp.gmail.com:587')
    server.starttls()
    server.login(username, password)
    server.sendmail(fromaddr, toaddrs, msg)
    server.quit()


if running is True:
    if floatSwitch is True:
        #Write the time and what happened to the file
        log.write(str(time.time() + "Float switch turned on")
        #Wait until switch is turned off

        while floatSwitch is True:
            startTime = time.time()
            if floatSwitch is False:
                log.write(str(now) + "Float switch turned off")
                break
        #if elapsedTime > 3 min (in the form of 180 seconds)
        elif elapsedTime() > 180:
            log.write(str(now) + "Sump Pump has been deemed broaken")
            sendEmail("The sump pump is now broken.")

else:
    log.write(str(time.time() + "The sctipt has stopped.")
    sendEmail("The script has been stopped.")

我的问题是在第52行说出

while floatSwitch is True:

代码中有错误，所有内容都是“语法无效” 我是Python的新手，这是我的第一个真正的项目。我不熟悉很多语法，所以这可能是一个非常基本的错误。任何人都可以帮我修复这个语句的语法，以便我可以让我的代码工作。我知道在没有剩下的代码的情况下还有很多其他错误，但我计划在找到它们时解决这些错误。我四处寻找，但我找不到像这样的另一个例子。非常感谢任何和所有的帮助！

Answer 1

实际上，问题在于上面的行 while循环。你缺少一个括号：

log.write(str(time.time() + "Float switch turned on")) here--^

此外，只是未来的提示，而不是这样做：

while floatSwitch is True:

这样做更干净：

while floatSwitch:

Answer 2

上一行中有一个不平衡的括号：

log.write(str(time.time() + "Float switch turned on"))  # Last parenthesis is missing

而且在sendEmail()方法中，你有一个缺失的开场语：

toaddrs = [to@email.com']  # Opening quote missing

Python while循环语法无效

2 个答案: