Why an object changes its "address" between adjacent calls?

[Jach Fong]

C:\Python34\Doc>py
Python 3.4.4 (v3.4.4:737efcadf5a6, Dec 20 2015, 19:28:18) [MSC v.1600 32 
bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import tkinter as tk
>>> root = tk.Tk()
>>> tk.Label(root, text='label one', font='TkDefaultFont').pack()
>>> from tkinter import font
>>> font.nametofont('TkDefaultFont')
<tkinter.font.Font object at 0x021E9490>
>>> font.nametofont('TkDefaultFont')
<tkinter.font.Font object at 0x021E9390>
>>>
The "address" of the Font object 'TkDefaultFont' changes, why?

Best Regards,
Jach Fong


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