on a system w/o python3

[snippsat]

Can just catch the ImportError,then will work python 2 and 3 in both Windows and Linux.

try:
    # Python 2
    import Tkinter as tk
except ImportError:
     # Python 3
    import tkinter as tk

root = tk.Tk()
w = tk.Label(root, text="Hello, world!")
w.pack()
root.mainloop()