wangsu.py

import psutil
import time
from tkinter import *

def make_app():
    app = Tk()
    app.geometry('300x150')
    app.config(bg='#303030')
    Label(text='Speed Monitor',
          font=('Arial',25,'bold'),
          bg='#303030',
          fg='white').pack()

    Label(name='lb2',
          text='_kb/s',
          font=('Hack',20,'bold'),
          bg='#303030',
          fg='white'
          ).pack()
    return app

def speed_test():
    s1 = psutil.net_io_counters(pernic=True)['en0']
    time.sleep(1)
    s2 = psutil.net_io_counters(pernic=True)['en0']
    result = s2.bytes_recv - s1.bytes_recv
    return str(result/1024) + 'kb/s'

def ui_update(do):
    data = do()
    lb2  = app.children['lb2']
    lb2.config(text=data)
    app.after(1000,lambda:ui_update(do))

app = make_app()
app.after(1000, lambda:ui_update(speed_test))
app.mainloop()