Which version of python goes well with tkinter?

[Larz60+]

pip only installs one version, which ever is the active version
You can find this with python -V
I believe in Linux that you use pip3 for python 3, and to run python 3, use python3

the wx version for python 2 is the old code, and I don't think it's maintained anymore.
Which version of python are you using?

If 2.7 switch now, don't get bogged down in a version which will only be supported for a couple more years.
Most new code will be written for python 3, not 2, and only sometimes both,