Re: [matplotlib-devel] Error in import matplotlib.pyplot using Python/C API

[Filipe S. <ma...@fi...>]

Em Ter 03 Set 2013 17:02:28 BRT, Benjamin Root escreveu:
>
> On Mon, Sep 2, 2013 at 12:27 AM, Filipe Saraiva
> <ma...@fi... <mailto:ma...@fi...>> wrote:
>
>     Hello,
>
>     First, thanks for this great library.
>
>     My name is Filipe Saraiva, I am developing a python backend for
>     Cantor, the KDE mathematical software. More infos can be read in
>     http://blog.filipesaraiva.info/?tag=gsoc2013-python-backend (in
>     portuguese and english).
>
>     Currently I have a problem when I try import pyplot in Cantor. I
>     am using Python 2.7.5 and matplotlib 1.3.0. The error is below:
>
>     import matplotlib.pyplot as plt
>     Traceback (most recent call last):
>       File "<string>", line 1, in <module>
>       File "/usr/lib64/python2.7/site-packages/matplotlib/pyplot.py",
>     line 98, in <module>
>         _backend_mod, new_figure_manager, draw_if_interactive, _show =
>     pylab_setup()
>       File
>     "/usr/lib64/python2.7/site-packages/matplotlib/backends/__init__.py",
>     line 25, in pylab_setup
>         globals(),locals(),[backend_name])
>       File
>     "/usr/lib64/python2.7/site-packages/matplotlib/backends/backend_qt4agg.py",
>     line 19, in <module>
>         _decref = ctypes.pythonapi.Py_DecRef
>       File "/usr/lib64/python2.7/ctypes/__init__.py", line 378, in
>     __getattr__
>         func = self.__getitem__(name)
>       File "/usr/lib64/python2.7/ctypes/__init__.py", line 383, in
>     __getitem__
>         func = self._FuncPtr((name_or_ordinal, self))
>     AttributeError: kde/bin/cantor: undefined symbol: Py_DecRef
>
>     Well, anyone have any idea about how can I fix it?
>
>     Thank you,
>
>
> My only guess is that there is some sort of linking/build error.
> Perhaps the python-qt4 library was built and linked against a
> different python on your system?
>
> Cheers!
> Ben Root

Really I don't know. I will question it to matplotlib maintainer.

The pyplot import in python iteractive mode (python terminal) is 
working properly. I can run a matplotlib example using pyplot in this 
mode. I get the error just in Python/C API.

--
Filipe Saraiva
http://filipesaraiva.info/