4.0.0b2 -- undefined symbol: _Py_ZeroStruct

I'm trying to update my Python package to (finally) use Python 3+, coming 
from 2.7. I wasn't the one who set up our environment originally, but by 
word of mouth I've heard we used the apt-get approach to install wxPython 
previously.

After not finding wxPython in the apt-get repositories, I figured I'd try 
the (personally, preferable) approach of using pip. I installed the 
prerequisites found HERE 
<https://github.com/wxWidgets/Phoenix/blob/master/README.rst#id8>. I dealt 
with a RAM limitation (on a Raspberry Pi) by adding a swap. And, after a 
few hours or so, the installation finished. I didn't think to turn on 
verbose printing, so I don't have the whole log for it on hand, at least 
that I'm aware of.

The incantation was:

$ sudo pip3 install --upgrade --find-links 
https://extras.wxpython.org/wxPython4/extras/linux/gtk3/ubuntu-16.04 
wxPython

The --find-links came from the main wxPython website HERE 
<https://www.wxpython.org/pages/downloads/>. We're running Ubuntu MATE 
16.04.

Here is info on the installation:

$ pip3 show wxPython
Name: wxPython
Version: 4.0.0b2
Summary: Cross platform GUI toolkit for Python, "Phoenix" version
Home-page: http://wxPython.org/
Author: Robin Dunn
Author-email: [email protected]
License: wxWindows Library License 
(https://opensource.org/licenses/wxwindows.php)
Location: /usr/local/lib/python3.5/dist-packages
Requires: six

As mentioned, the previous wxPython installation was done using apt-get, so 
doing a "pip show" doesn't give anything. However, doing a help(wx) after 
importing tells me the path to it is:

    /usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/__init__.py

However, now when I try to "import wx", I get the following:

Python 3.5.2 (default, Sep 14 2017, 22:51:06)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import wx
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.5/dist-packages/wx/__init__.py", line 17, in 
<module>
    from wx.core import *
  File "/usr/local/lib/python3.5/dist-packages/wx/core.py", line 12, in 
<module>
    from ._core import *
ImportError: 
/usr/local/lib/python3.5/dist-packages/wx/_core.cpython-35m-arm-linux-gnueabihf.so: 
undefined symbol: _Py_ZeroStruct

Have I missed a step somewhere? Is it still trying to use something from 
the old installation, which is still around?

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