[英]Python while loop with invalid syntax
只是为了在展示代码之前为我正在从事的项目提供一些背景知识。 我目前正在开发一个Python脚本,该脚本将在Raspberry Pi上运行,以监视来自地下室污水泵的浮球开关。 此代码将根据以下两个条件检查污水泵是否不起作用:
我还没有用完其余的代码,但是这里是我所拥有的:
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行显示
while floatSwitch is True:
代码中有一个错误,它说的是“无效语法”,我对Python还是很陌生,这是我第一个使用它的真实项目。 我不熟悉很多语法,因此这可能是一个非常基本的错误。 谁能帮助我修复此语句的语法,以便使我的代码正常工作。 我知道在没有其余代码的情况下还有许多其他错误,但是我计划在发现这些错误时加以解决。 我到处搜索,但是找不到其他这样的示例。 任何帮助都非常感谢!
实际上,您的问题出在while循环上方 。 您缺少括号:
log.write(str(time.time() + "Float switch turned on"))
here--^
另外,这只是未来的提示,而不是这样做:
while floatSwitch is True:
这样做比较干净:
while floatSwitch:
上一行的括号不平衡:
log.write(str(time.time() + "Float switch turned on")) # Last parenthesis is missing
而且在sendEmail()
方法中,您还缺少开头的引号:
toaddrs = [to@email.com'] # Opening quote missing
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