Why does Python installed via Homebrew not include Tkinter

Question

I've installed Python via Homebrew on my Mac.

brew install python 

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

import Tkinter 

I got 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 

Answer 1

I am running MacOS Big Sur (11.2.3).

With python2, I have Tkinter built-in.

With python3, it has to be installed manually and it's very simple, just run:

$ brew install python-tk 

To run python2 in a terminal, execute python file.py.

To run python3 in a terminal, execute python3 file.py.