title: Tkinter buttons run another program
body: <p>I have four different python programs which I want to be executed as an event when the user presses a defined Tkinter button present on a separate python file. This python file looks like this so far:</p>
  
  <pre><code>from tkinter import *
  from tkinter import ttk
  
  def arvuta():
  
      return 
  
  VCalc = Tk()
  VCalc.title("V-Calc")
  VCalc.configure(background='#E6F3FE')
  
  nupp = ttk.Button(VCalc, text="prog1", command=arvuta)
  nupp.grid(column=1, row=1, padx=3, pady=3, sticky=(N, S, W, E))
  
  nupp2 = ttk.Button(VCalc, text="prog2", command=arvuta)
  nupp2.grid(column=2, row=1, padx=3, pady=3, sticky=(N, S, W, E))
  
  nupp3 = ttk.Button(VCalc, text="prog3", command=arvuta)
  nupp3.grid(column=1, row=3, padx=3, pady=3, sticky=(N, S, W, E))
  
  nupp4 = ttk.Button(VCalc, text="prog4", command=arvuta)
  nupp4.grid(column=2, row=3, padx=3, pady=3, sticky=(N, S, W, E))
  
  VCalc.mainloop()
  </code></pre>
  
  <p>Is it possible to execute a python program from another one using Tkinter buttons?</p>