如果设置为repeat，则Python - Function不能执行

Question

我刚开始学习Python，但我搞不清楚这一点，基本上我想监控我的网络流量，运行下面的代码将只显示当前捕获的结果，但不会更新

from tkinter import*
import psutil,os
from psutil._common import bytes2human
from threading import Timer
import time

netmon = Tk()
netmon.title("NetMonitor")
netmon.geometry("200x80")

def getresults():
    total_before = psutil.net_io_counters()
    time.sleep(1)
    total_after = psutil.net_io_counters()
    download_rate = "Download : " + bytes2human(total_after.bytes_recv - total_before.bytes_recv) + " KB/S"
    upload_rate = "Upload : " + bytes2human(total_after.bytes_sent - total_before.bytes_sent) + " KB/S"
    text = Label(netmon, text = "\n" + download_rate + "\n\n" + upload_rate, anchor = NW)
    text.pack()
    #Timer(5, getresults).start

getresults()

netmon.mainloop()

我尝试过while循环：

.
.
.
while True:
   getresults()

netmon.mainloop()

我已经尝试了线程计时器，但是在这两种情况下，“程序”甚至不会启动，直到我恢复到上面提到的第一个代码，谁能告诉我如何让它每秒更新一次？

Answer 1

您走上了正确的道路，需要使用while循环。我将它放入它自己的线程中(并将文本作为构造函数参数传递给thread类)。

from tkinter import*
import psutil,os
from psutil._common import bytes2human
from threading import Timer
import time
import threading

netmon = Tk()
netmon.title("NetMonitor")
netmon.geometry("200x80")

text = Label(netmon, text = "\n" + 'Download : TBD' + "\n\n" + 'Upload : TBD', anchor = NW)
text.pack()

class GetUpdates(threading.Thread):
    def __init__(self, text):
        threading.Thread.__init__(self)
        self._stop_event = threading.Event()
        self._text = text

    def stop(self):
        self._stop_event.set()

    def run(self):
        while not self._stop_event.is_set():
            total_before = psutil.net_io_counters()
            time.sleep(1)
            total_after = psutil.net_io_counters()
            download_rate = "Download : " + bytes2human(total_after.bytes_recv - total_before.bytes_recv) + " KB/S"
            upload_rate = "Upload : " + bytes2human(total_after.bytes_sent - total_before.bytes_sent) + " KB/S"
            self._text['text'] = "\n" + download_rate + "\n\n" + upload_rate


getupdates = GetUpdates(text)
getupdates.start()


netmon.mainloop()

Answer 2

一种更简单的方法是通过APScheduler的BackgroundScheduler实现一个解决方案：

from apscheduler.schedulers.background import BackgroundScheduler
backgroundScheduler = BackgroundScheduler(daemon=True)

backgroundScheduler.add_job(lambda : backgroundScheduler.print_jobs(),'interval',seconds=4)
backgroundScheduler.start()

..。然后在完成时

backgroundScheduler.shutdown()