global variables, classes, imports

[Larz60+]

Correct me if I am wrong, but I think your saying that you want to something like the following:

from tkinter import *

class Notepad:
    def __init__(self):
        self.root = Tk()

def main():
    np = Notepad()
    master = np.root
    master.mainloop()

if __name__ == '__main__':
    main()