sudo eopkg install --reinstall python3-tkinter tk tcl python3 tcl-devel tk-devel

$  sudo eopkg it --reinstall python3-tkinter tk tcl     
Password: 
Following packages will be installed:
python3-tkinter  tcl  tk
Total size of package(s): 2.21 MB
Downloading 1 / 3
Package tcl found in repository Solus
tcl-8.6.6-5-1-x86_64.eopkg [cached]
Downloading 2 / 3
Package tk found in repository Solus
tk-8.6.6-4-1-x86_64.eopkg [cached]
Downloading 3 / 3
Package python3-tkinter found in repository Solus
python3-tkinter-3.5.2-12-1-x86_64.eopkg [cached]
Installing 1 / 3
tcl-8.6.6-5-1-x86_64.eopkg [cached]
Installing tcl, version 8.6.6, release 5
Running pre removal operations for tcl
Running post removal operations for tcl
Extracting the files of tcl
Configuring tcl package
Configured tcl
Installed tcl
Installing 2 / 3
tk-8.6.6-4-1-x86_64.eopkg [cached]
Installing tk, version 8.6.6, release 4
Running pre removal operations for tk
Running post removal operations for tk
Extracting the files of tk
Configuring tk package
Configured tk
Installed tk
Installing 3 / 3
python3-tkinter-3.5.2-12-1-x86_64.eopkg [cached]
Installing python3-tkinter, version 3.5.2, release 12
Running pre removal operations for python3-tkinter
Running post removal operations for python3-tkinter
Extracting the files of python3-tkinter
Configuring python3-tkinter package
Configured python3-tkinter
Installed python3-tkinter
$  python3
Python 3.5.2 (default, Nov 12 2016, 19:04:03) 
[GCC 6.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import tkinter              
>>> tkinter._test()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.5/tkinter/__init__.py", line 3837, in _test
    root = Tk()
  File "/usr/lib/python3.5/tkinter/__init__.py", line 1868, in __init__
    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: unknown color name "BACKGROUND"