how to open a window in python

1import tkinter as tk
2 
3 
4def new_window1():
5    " new window"
6    try:
7        if win1.state() == "normal": win1.focus()
8    except NameError as e:
9        print(e)
10        win1 = tk.Toplevel()
11        win1.geometry("300x300+500+200")
12        win1["bg"] = "navy"
13        lb = tk.Label(win1, text="Hello")
14        lb.pack()
15 
16 
17win = tk.Tk()
18win.geometry("200x200+200+100")
19button = tk.Button(win, text="Open new Window")
20button['command'] = new_window1
21button.pack()
22win.mainloop()
23