Make virtual environment env under top-level folder (of course).

Use proper multi-folder import strategy (of course).

pip install everything including wxpython

Before installing wxpython, sudo apt install libgtk-3-dev libwebkit2gtk-4.0-dev and pip install wheel (so a wheel gets used). Need libwebkit2gtk-4.0-dev otherwise wxPython will not be compiled with wx.html2 support for backend. Will fail when wx.html2.WebView.New() because backend not compiled and thus not available. See https://discuss.wxpython.org/t/wxdemo-html2-possible-bug/34760.