create dropdown menu

from tkinter import*

def add_button():
    button1 = Button(text = "Button")
    button1.pack()

def add_text():
    label1 = Label(text = "Text")
    label1.pack()

root = Tk()
root.title("Application")
root.resizable(width=False, height=False) #Not resizable<--!-->
root.geometry("500x300") #Set width and height<--!-->

menu1 = Menu(root)

root.config(menu = menu1)

subMenu1 = Menu(menu1)

menu1.add_cascade(label = "Add", menu = subMenu1) #Add subMenu1 as dropdown menu on main menu1.

subMenu1.add_command(label = "Button", command = add_button) #Add item to subMenu1 and command.
subMenu1.add_separator()
subMenu1.add_command(label = "Text", command = add_text)

root.mainloop() #When mainloop is breaked the program ends.