own library with global tkinter window

Question

I want to create a library that modify the tkinter window i created in a script. I want it in a library in order my main script not to be too big, but when i call my library, well, it doesn't work.

Here is the main script:
import my_lib
from tkinter import *

global my_window
my_window = Tk()

global my_button
my_button = Button(my_window, "This is a button", command = my_lib.menu)

and the library:

def menu():
    my_button.destroy()

    global menu_button
    menu_button = Button(my_window, "Button", command = print("You hit the button"))

By launching the main script I get the following error:

File "main_script.py, line 8, in <module>
 my_button = Button(my_window, "This is a button", command = my_lib.menu)
File "C:\\Program Files\Pytonh 3.4\lib\tkinter\__init__.py", line 2192, in __init__
  Widget.__init__(selfn master, 'button', cnf, kw)
File "C:\\Program Files\Pytonh 3.4\lib\tkinter\__init__.py", line 2113, in __init__
  cnf = _cnfmerge((cnf, kw))
File "C:\\Program Files\Pytonh 3.4\lib\tkinter\__init__.py", line 105, in _cnfmerge
  cnf.update(c)
ValueError: dictionnary update sequence element #0 has length 1; 2 is required

Answer 1

Replace:

my_button = Button(my_window, "This is a button", command = my_lib.menu)

by:

my_button = Button(my_window, text="This is a button", command = my_lib.menu)

(and the same in your "lib" -in python module is the usual term)

See http://effbot.org/tkinterbook/button.htm#Tkinter.Button-class for Button documentation.