Python脚本占用的cpu太多

Question

我不是编程专家，所以我在谷歌上搜索了很多才能让这个脚本工作。它在串行接口上侦听，并搜索3个值（温度、湿度和电池电量）。如果它找到其中一个zhem，它会将其保存到一个文本文件中，并检查该值是否高于或低于某个级别。如果是这种情况，它会发送一封电子邮件进行警告。

我的问题是它持续使用大约99%的cpu功率。。。你能帮我把CPU的使用量限制在最低限度吗。

感谢

#!/usr/bin/env python
# -*- coding: utf-8 -*- 
import serial
import time
import sys
import smtplib
from time import sleep
def mail(kind, how, value, unit):
    fromaddr = '[e-mail]'
    toaddrs  = '[e-mail]'
    msg =  "rn".join([
    "From: sender",
    "To: recipient",
    "Subject: Warning",
    "",
    "The " + str(kind) + " is too " + str(how) + ". It is " + str(value) + str(unit)
    ])
    username = 'user'
    password = 'password'
    server = smtplib.SMTP('server:port')
    server.ehlo()
    server.starttls()
    server.login(username,password)
    server.sendmail(fromaddr, toaddrs, msg)
    server.quit()
def main():
        port = '/dev/ttyAMA0'
        baud = 9600
        ser = serial.Serial(port=port, baudrate=baud)
        sleep(0.2)    
        while True:
            while ser.inWaiting():
                # read a single character
                char = ser.read()
                # check we have the start of a LLAP message
                if char == 'a':
                # start building the full llap message by adding the 'a' we have
                llapMsg = 'a'
                # read in the next 11 characters form the serial buffer
                # into the llap message
                llapMsg += ser.read(11)

        if "TMPB" in llapMsg:
            TMPB = llapMsg[7:]
            with open("TMPB.txt", "w") as text_file:
                text_file.write(TMPB)
                if float(TMPB) >= 19:
                    mail("temperature", "high", TMPB, "°C")
                elif float(TMPB) <= 15:
                    mail("temperature", "low", TMPB, "°C")
                else:
                    pass
        elif "HUMB" in llapMsg:
            HUMB = llapMsg[7:]
            with open("HUMB.txt", "w") as text_file:
                text_file.write(HUMB)
                if float(HUMB) >= 80:
                    mail("humidity", "high", HUMB, "%")
                elif float(HUMB) <= 70:
                    mail("humidity", "low", HUMB, "%")
                else:
                    pass
        elif "BATT" in llapMsg:
            BATT = llapMsg[7:11]
            with open("BATT.txt", "w") as text_file:
                text_file.write(BATT)
                if float(BATT) < 1:
                    mail("battery level", "low", BATT, "V")
                else:
                    pass
        sleep(0.2)
if __name__ == "__main__":
        main()

Answer 1

我自己解决了这个问题。

while ser.inWaiting():循环导致cpu负载过重。我删除了它并更正了缩进，它在几%的cpu负载下工作得很好。

谢谢你的提示，它帮助我解决了这个问题。