[Python] Why does Python installed via Homebrew not include Tkinter? [duplicate]

I've installed Python via Homebrew on my Mac.

brew install python


After that, I checked my Python version as 2.7.11, and then I tried to perform

import Tkinter


I got the following error message:

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py", line 39, in <module>
import _tkinter # If this fails your Python may not be configured for Tk
ImportError: No module named _tkinter

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