how to install python3-tk in centos?

Question

I need to install python3-tk in order to use matplotlib.

I have tried: 

(python_3.4_numerical) [lpuggini@machinelearn-1 ~]$ sudo yum install python3-tk
[sudo] password for lpuggini: 
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No package python3-tk available.
Error: Nothing to do
(python_3.4_numerical) [lpuggini@machinelearn-1 ~]$ 

but it is not working.

How can I fix it?

EDIT: Installing from pip does not work:

(python_3.4_numerical) [lpuggini@machinelearn-1 ~]$ pip install pygtk
Collecting pygtk
  Using cached pygtk-2.24.0.tar.bz2
    Complete output from command python setup.py egg_info:
    ********************************************************************
    * Building PyGTK using distutils is only supported on windows. *
    * To build PyGTK in a supported way, read the INSTALL file.    *
    ********************************************************************

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-nzjsuhx3/pygtk/
(python_3.4_numerical) [lpuggini@machinelearn-1 ~]$ 

Answer 1

tkinter is available in coreos as tkinter package. You can install it with

sudo yum install tkinter

Once it is done, you can import and use it as usual.

>>> import tkinter
>>> tkinter._test()

For Python 3, you can install it with

sudo yum install python3-tkinter

As some users mentioned, it is available as python36u-tkinter or python34-tkinter depending on OS.

sudo yum install python34-tkinter
sudo yum install python36u-tkinter