python - Tkinter threading and return to text widget -


i've read post on stack overflow,issues intercepting subprocess output in real time, redirect command line results tkinter gui, know have use threading , queue in tkinter, still can't same thing because beginner in program,please help.

the goal: when press button, getting 'top' command output , realtime display in tkinter text widget

the issue: i've tried follow code, still cannot output, have not idea how make work.

from tkinter import * import tkinter tk import subprocess threading import thread queue import queue  window = tk.tk() window.title('realtime') window.geometry('800x400')         text = tk.text(window) text.pack() button = tk.button(window, text= 'press') button.pack()   window.mainloop()

this gui outlook, please help

top refreshes , , i'm guessing that's behavior want capture threading , whatnot. in case easier ask top run once, , have tkinter timing , refreshing: 

import tkinter tk sh import top  def update_text():     text.delete(0.0, tk.end)     text.insert(0.0, top('-b', n=1))     window.after(1000, update_text) # call function again in 1 second  window = tk.tk() window.title('realtime') window.geometry('800x400')  text = tk.text(window) text.pack() button = tk.button(window, text= 'press', command=update_text) button.pack()  window.mainloop()

you may need install sh run top did, or use subprocess.check_output if want. 

text.insert(0.0, subprocess.check_output(['top', '-b', '-n 1']))

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