matplotlib-devel Mailing List for matplotlib

Em Ter 10 Set 2013 19:21:01 BRT, Christoph Gohlke escreveu:
> On 9/10/2013 1:54 PM, Eric Firing wrote:
>> On 2013年09月10日 5:43 AM, Michael Droettboom wrote:
>>> Do any of those use ctypes? Try creating a minimal ctypes example and
>>> see if that works.
>>
>> Mike,
>>
>> I was a bit horrified to see that ctypes import and usage in mpl;
>> fortunately it is a workaround for a PySide bug, and should only be
>> temporary, if it should be there at all.
>>
>> Eric
>>
>
> Don't be horrified. The Ctypes workaround went trough the mailing list,
> a PR with discussions including most core developers, testing, several
> beta/rc/final versions, and real word usage. It fixes a problem that is
> still present today without it: the Qt4Agg backend is practically
> unusable with any recent version of PySide on CPython 3.x. Anyway, the
> Ctypes code could be put in a try/except statement for environments that
> don't support Ctypes or Python's C API.
If I understood correctly is there a problem with Qt4Agg in matplotlib 
1.3?
Another KDE developer typed:
import matplotlib
from matplotlib import pyplot as plt
In my software (Cantor backend for python) and he got the error below:
Traceback (most recent call last):
File "", line 1, in
File "/usr/lib/python2.7/site-packages/matplotlib/pyplot.py", line 98, 
in
_backend_mod, new_figure_manager, draw_if_interactive, _show = 
pylab_setup()
File 
"/usr/lib/python2.7/site-packages/matplotlib/backends/__init__.py", line
25, in pylab_setup
globals(),locals(),[backend_name])
File 
"/usr/lib/python2.7/site-packages/matplotlib/backends/backend_qt4agg.py",
line 13, in
from backend_qt4 import QtCore, QtGui, FigureManagerQT, FigureCanvasQT,\
File 
"/usr/lib/python2.7/site-packages/matplotlib/backends/backend_qt4.py",
line 25, in
from qt4_compat import QtCore, QtGui, _getSaveFileName, __version__
File 
"/usr/lib/python2.7/site-packages/matplotlib/backends/qt4_compat.py",
line 36, in
import sip
ImportError: /usr/lib/python2.7/site-packages/sip.so: undefined symbol:
PyExc_SystemError
One more info, I removed matplotlib 1.3 and installed matplotlib 1.2 
using pip and it worked properly. I can use matplotlib in this version.
Thank you;
--
Filipe Saraiva
http://filipesaraiva.info/