Re: 4.0.0b2 -- undefined symbol: _Py_ZeroStruct

Erik Johnson wrote:
> 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
>


Did you build that instance of Python yourself? If so, did you configure
it with --enable-shared? If so, is that libpython shared library being
loaded at runtime when _core is imported?  You can check the last item
by running:

    ldd
/usr/local/lib/python3.5/dist-packages/wx/_core.cpython-35m-arm-linux-gnueabihf.so

If not, then you can probably fix it by setting LD_LIBRARY_PATH or
editing /etc/ld.so.conf


-- 
Robin Dunn
Software Craftsman
http://wxPython.org

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