wxPython Phoenix is the latest version of wxPython, (currently Sept 2016 without an official release). It supports both Python 2 and Python 3. You can download a snapshot build (i.e. a Python wheel) for your platform and Python version here.
wxPython Phoenix utilizes a largely automated mechanism for generating both the python bindings for the wxWidgets library and the documentation. Phoenix wxPython documentation is specifically generated for itself using Sphinx. This increases clarity as opposed to C++ documentation of the classic build, which includes many overloads that are not available in wxPython.
Python and pip must be installed before wxPython Phoenix can be installed.
You can use pip to install the Phoenix version of wxPython. Here is the recommended method currently:
python -m pip install --no-index --find-links=http://wxpython.org/Phoenix/snapshot-builds/ --trusted-host wxpython.org wxPython_Phoenix
When you use this command, pip will also install wxWidgets. This complex pip command will likely become 'pip install wxpython' when Phoenix is officially released.
Note: wxPython Phoenix is currently in beta and doesn't have all the widgets that the Classic version has.