Python – Is Pyside incompatible with python 3.6.4?

I followed the steps to install Pyside on Python 3.6.4 on my macOS 13.13.4 Github pageBut after running pip install -U PySide I get the following error message, which seems to indicate that Pyside is not compatible with Python 3.6.4?? :

mymacs-MacBook-Pro:~ mymac$ pip install -U PySide
Collecting PySide
Using cached https://files.pythonhosted.org/packages/36/ac/ca31db6f2225844d37a41b10615c3d371587677efd074db29855e7035de6/PySide-1.2.4.tar.gz
Complete output from command python setup.py egg_info:
only these python versions are supported: [(2, 6), (2, 7), (3, 2), (3, 3), (3, 4)]

----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/jq/yyp9q2fs1z5780k9l1_2ph4r0000gn/T/pip-install-zz9h16bx/PySide/
mymacs-MacBook-Pro:~ mymac$

Do I have anaconda, I looked at this website and this stackoverflow page I tried conda install -c anaconda pyside and conda install -c conda-forge pyside, but they both throw the same error message:

Solving environment: failed

UnsatisfiableError: The following specifications were found to be in conflict:
- pyqt
- pyside
Use "conda info <package>" to see the dependencies for each package.

Thank you very much for your help!