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
>> <m...@filipesaraiva.info <mailto:m...@filipesaraiva.info>> 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
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