程式語言 - Python - Tkinter - Button

參考資訊：
https://tkdocs.com/shipman/
https://www.pythontutorial.net/tkinter/tkinter-window/

main.py

import tkinter as tk
from tkinter import messagebox

root = tk.Tk()
root.title('main')
root.geometry('300x300')

def btn_handler():
    messagebox.showinfo('Info', 'test')

btn = tk.Button(root, text = 'test', command = btn_handler, font = ('Monospace', 14))
btn.pack()

root.mainloop()

執行

$ python3 main.py