from Tkinter import *
import os
import subprocess

root = Tk()
root.title("MUT Tester")
root.geometry("500x500")

def button():

cmd= os.system("adb devices")


b = Button(root, text="Enter", width=30, height=2, command = lambda:(button))
b.pack()

root.mainloop()

b = Button(root, text="Enter", width=30, height=2, command = lambda:(button))