simple tkinter frame with inheritance

main.py

import tkinter

class Test(tkinter.Frame):

    def __init__(self, parent):
        tkinter.Frame.__init__(self, parent)
        
        # create entry class attribute
        self.entry = tkinter.Entry(self)
        self.entry.grid(row=0, column=1)

    def set_myvar(self):
        self.var = "new hello world"

# main program
root = tkinter.Tk()
frame = Test(root)
frame.pack()

root.mainloop()