On 2013/09/11 8:49 AM, Filipe Saraiva wrote: > Em Ter 10 Set 2013 19:21:01 BRT, Christoph Gohlke escreveu: >> On 9/10/2013 1:54 PM, Eric Firing wrote: >>> On 2013/09/10 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
Again, this is a failure of a module to find a Python API symbol. In this case, it is not a matplotlib module, it is sip, part of pyqt4. It seems like some sort of linking problem. > > 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. I'm glad you found something that works; but I don't know why it does. Eric > > Thank you; > > -- > Filipe Saraiva > http://filipesaraiva.info/ > > ------------------------------------------------------------------------------ > How ServiceNow helps IT people transform IT departments: > 1. Consolidate legacy IT systems to a single system of record for IT > 2. Standardize and globalize service processes across IT > 3. Implement zero-touch automation to replace manual, redundant tasks > http://pubads.g.doubleclick.net/gampad/clk?id=51271111&iu=/4140/ostg.clktrk > _______________________________________________ > Matplotlib-devel mailing list > Matplotlib-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-devel > ------------------------------------------------------------------------------ How ServiceNow helps IT people transform IT departments: 1. Consolidate legacy IT systems to a single system of record for IT 2. Standardize and globalize service processes across IT 3. Implement zero-touch automation to replace manual, redundant tasks http://pubads.g.doubleclick.net/gampad/clk?id=51271111&iu=/4140/ostg.clktrk _______________________________________________ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
