Python 3.7事件循环

问题描述

我在Raspberry Pi 3b上使用Python 3.7.3，并且试图确定最适合我的事件循环，还尝试了解asyncio和线程以及它们的用途。我目前在代码中使用QTimer（）每隔1/2秒执行一次函数，该函数测试当前时间以查看是打开还是关闭鸡舍门的日出时间或黄昏。

使用time.sleep（）

#!/usr/bin/python3

import time,sys

class main():
    def __init__(self):
        self.door_status = 'unknown'
        self.run()

    def open_door(self):
        self.door_status = 'opening'
        # it takes about 60 seconds to open the door
        time.sleep(60)
        self.door_status = 'open'

    def close_door(self):
        self.door_status = 'closing'
        # it takes about 60 seconds to close the door
        time.sleep(60)
        self.door_status = 'closed'

    def run(self):
        while True:
            """
            check time and open/close door as needed
            if time to open door and door not opening or open
            self.open_door()
            elif time to close door and door not closing or closed
            self.close_door()
            """
            time.sleep(0.1)
            # the follownig is to just let me know it's alive
            time_fmt = "It's %I:%M:%S %p on %A,%b %d,%Y"
            time_str = time.strftime(time_fmt)
            sys.stdout.write(time_str)
            sys.stdout.flush()
            time.sleep(0.1)
            sys.stdout.write("\b"*len(time_str))

if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        print("\n Processed Stopped")

"""
top -p 19905

top - 08:30:51 up 22 days,1:08,1 user,load average: 0.80,1.22,1.52
Tasks:   1 total,0 running,1 sleeping,0 stopped,0 zombie
%Cpu(s):  7.3 us,3.6 sy,0.0 ni,88.9 id,0.0 wa,0.0 hi,0.2 si,0.0 st
MiB Mem :  15930.8 total,3961.1 free,5104.3 used,6865.4 buff/cache
MiB Swap:  16271.0 total,15949.2 free,321.8 used.   9816.1 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                                  
19905 john      20   0   16732   8296   5560 S   0.3   0.1   0:00.18 coop3t                                   
"""

使用QTimer（）

#!/usr/bin/python3

import time,sys
from PyQt5.QtWidgets import QApplication
from PyQt5.QtCore import QTimer

class main(QApplication):
    def __init__(self,*args,**kwargs):
        super(main,self).__init__(*args,**kwargs)
        self.door_status = 'unkown'
        updateTimer = QTimer(self)
        updateTimer.timeout.connect(self.run)
        updateTimer.start(1000)

    def open_door(self):
        self.door_status = 'opening'
        # it takes about 60 seconds to open the door
        time.sleep(60)
        self.door_status = 'open'

    def close_door(self):
        self.door_status = 'closing'
        # it takes about 60 seconds to close the door
        time.sleep(60)
        self.door_status = 'closed'

    def run(self):
        while True:
            """
            check time and open/close door as needed
            if time to open door and door not opening or open
            self.open_door()
            elif time to close door and door not closing or closed
            self.close_door()
            """
            time.sleep(0.1)
            # the follownig is to just let me know it's alive
            time_fmt = "It's %I:%M:%S %p on %A,%Y"
            time_str = time.strftime(time_fmt)
            sys.stdout.write(time_str)
            sys.stdout.flush()
            time.sleep(0.1)
            sys.stdout.write("\b"*len(time_str))

if __name__ == '__main__':
    try:
        app = main(sys.argv)
        app.exec_()
    except KeyboardInterrupt:
        print("\n Processed Stopped")

"""
john@d10cave:~$ top -p 20069

top - 11:44:52 up 22 days,4:22,load average: 1.15,1.34,1.41
Tasks:   1 total,0 zombie
%Cpu(s):  6.2 us,3.0 sy,90.8 id,0.1 si,3764.0 free,5222.0 used,6944.9 buff/cache
MiB Swap:  16271.0 total,321.8 used.   9695.0 avail Mem 

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND                                  
20069 john      20   0  441084  50252  36616 S   0.3   0.3   0:10.67 coop3q                                   
"""

最大的问题是，在我的情况下，线程或异步会做任何事情来使程序功能更好吗？如果是这样，那么一个例子会很好。

谢谢 JT

解决方法

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