tkinter is available in coreos like tkinter. You can install it with
sudo yum install tkinter
Once this 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 mentioned by some users, it is available as python36u-tkinteror python34-tkinterdepending on the OS.
sudo yum install python34-tkinter
sudo yum install python36u-tkinter
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