On 09/10/2013 10:05 AM, Filipe Saraiva wrote:
> Em Ter 10 Set 2013 09:33:37 BRT, Michael Droettboom escreveu:
>> On 09/10/2013 08:23 AM, Filipe Saraiva wrote:
>>> Em Ter 03 Set 2013 17:02:28 BRT, Benjamin Root escreveu:
>>>> On Mon, Sep 2, 2013 at 12:27 AM, Filipe Saraiva
>>>> <[email protected] <mailto:[email protected]>> 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.
>>>
>>
>> It looks like it's failing inside of ctypes. How are you including
>> Python in your application. Perhaps the ctypes module (which is a C
>> extension module that comes in the Python standard library) is not being
>> included or found. I'm at a bit of a loss, but this seems like more of
>> a general "embedding python in a C application" question, which you
>> might try asking on the Python mailing list.
>>
>> Mike
>>
>
> I am using my code with several python modules and I can not get any
> error. I tried scipy, numpy, Spade, matplotlib... interesting, I don't
> get error when I import matplotlib.animation.
Do any of those use ctypes? Try creating a minimal ctypes example and
see if that works.
Mike
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