import tkinter as tk

import subprocess

'''Command takes some time so it freezes GUI'''

# --- functions ---

def ping():

# without `shell=True` - cmd as list

cmd = ["ping", "-c", "2", entry.get()]

output = subprocess.check_output(cmd)

# with `shell=True` - cmd as string

#cmd = "ping -c 2 {}".format(entry.get())

#output = subprocess.check_output(cmd, shell=True)

result.insert('end', output.decode('utf-8'))

# --- main ---

root = tk.Tk()

l = tk.Label(root, text="Enter IP or host")

l.pack()

entry = tk.Entry(root, textvariable=entry)

entry.pack()

b = tk.Button(root, text="RUN", command=ping)

b.pack()

result = tk.Text(root)

result.pack()

root.mainloop()