Which version of python goes well with tkinter?

[Barrowman]

Not having any success with wxpython phoenix. demo.py wont run. It complains that wx isn't installed. The README files suggest running python but that is linked to 2.7x so i have been running python3 but still not getting anywhere.
Just did it again but here is what I got

python3.6 ./demo.py
Traceback (most recent call last):
  File "./demo.py", line 3, in <module>
    import Main
  File "/home/norman/programming/python/wxpython/wxPython-4.0.0b2/demo/Main.py", line 61, in <module>
    import wx
ModuleNotFoundError: No module named 'wx'

I have tried using pip3 and I have version 9.0.1 installed but the script still fails and tells me I am running pip version 8.1.1

Command "/usr/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-hde6hd9b/wxPython/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /tmp/pip-930y_3pe-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /tmp/pip-build-hde6hd9b/wxPython/
You are using pip version 8.1.1, however version 9.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

I think I will just stick with tkinter until I can install from the repositories.