[파이썬] 문제 : 버튼 클릭시 외부프로그램 실행 (tkinter)

import subprocess
import os
from tkinter import *
from tkinter import messagebox
 
root = Tk()
 
# 버튼 클릭 이벤트
def okClick():
    exe_name = txt.get()
    # messagebox.showinfo("Message", exe_name)
    # subprocess.run('notepad')
    os.system('start ex01.exe')                    # CMD 창 실행(start)

lbl = Label(root, text="exe name", width=20)
lbl.grid(row=0, column=0)
txt = Entry(root)
txt.grid(row=0, column=1)
 
btn = Button(root, text="OK", command=okClick)
 
btn.grid(row=1, column=1)
 
root.mainloop()