How do i get the output of tkinter to print into GUI instead of CLI?

Question

I have been working on with this code and I get my output to the terminal. How do i get the output to print in the tkinter GUI window insted? Here's the code:

import sys import os from tkinter import * def ping(): myinptext = entry.get() os.system("ping "+entry.get()+" -c 2" ) myGui = Tk() entry = StringVar() myGui.geometry('300x300') myGui.title("Get output inside GUI") mylabel = Label(myGui,text="Enter target IP or host as required.").pack() mybutton = Button(myGui,text ="Ping Test",command = ping).pack() myEntry = Entry(myGui,textvariable=entry).pack() myGui.mainloop()

Widget(...).pack() returns None so you assign None to mylabel, mybutton and myEntry. If you really need variable mylabel you have to do in two steps mylabel = Label(..) and mylabel.pack(). But in your example you don't need this variables so you can do without variables - Label(...).pack() — furas
– furas, Commented Dec 15, 2016 at 16:28

furas · Accepted Answer · 2016-12-15 16:42:07Z

Use subprocess instead of os.system. There are many functions to work with external command.

I use subprocess.check_output() to get result of executed command. Command has to be as list ["ping", entry.get(), "-c", "2"]. Command can be single string if you use shell=True.

import tkinter as tk import subprocess def ping(): cmd = ["ping", entry.get(), "-c", "2"] output = subprocess.check_output(cmd) #output = subprocess.check_output("ping {} -c 2".format(entry.get()), shell=True) print('>', output) # put result in label result['text'] = output.decode('utf-8') my_gui = tk.Tk() entry = tk.StringVar() my_gui.geometry('300x300') my_gui.title("Get output inside GUI") tk.Label(my_gui, text="Enter target IP or host as required.").pack() tk.Entry(my_gui, textvariable=entry).pack() tk.Button(my_gui,text="Ping Test", command=ping).pack() # label for ping result result = tk.Label(my_gui) result.pack() my_gui.mainloop()

BTW: because ping takes some time so tkinter will freeze for this time. If you need non-freezing version you will need other functions in subprocess or threading module.

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