module alias in import statement

Mon Apr 4 16:46:52 EDT 2016

On 4/4/2016 11:31 AM, ast wrote:
> 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 ?

Nope. As other said, 'import tkinter as tk' imports a module named 
'tkinter' and *in the importing modules, and only in the importing 
module*, binds the module to 'tk'. It also caches the module in 
sys.modules under its real name, 'tkinter'.
 >>> import tkinter as tk
 >>> import sys
 >>> 'tkinter' in sys.modules
True
 >>> 'tk' in sys.modules
False
'import tk.ttk' looks for 'tk' in sys.modules, does not find it, looks 
for a module named 'tk' on disk, does not find it, and says so.
-- 
Terry Jan Reedy