module alias in import statement

[ast]

hello

import tkinter as tk
import tk.ttk as ttk

Traceback (most recent call last):
 File "<pyshell#3>", line 1, in <module>
   import tk.ttk as ttk
ImportError: No module named 'tk'


of course

import tkinter.ttk as ttk

works

Strange, isn't it ?
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