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copied!<p>I experienced a similar error today, concerning code that I know for a fact was working a week ago. I also have recently uninstalled/reinstalled both Matplotlib and Numpy, while checking something else (I'm using Python 2.5).</p> <p>The code went something like this:</p> <pre><code>self.ax.cla() if self.logy: self.ax.set_yscale('log') self.canvas.draw() </code></pre> <p>Whenever it was run with self.logy as True, it failed as above. Otherwise, it worked perfectly fine.</p> <p>I ended up sidsteping the issue by uninstalling Matplotlib and Numpy and installing the latest versions of them. However, the version throwing the error had previously been used with no problems. Only after swapping the old version for the newer one and back again did this start happening.</p> <p>Perhaps the uninstall/reinstall process messes up certain aspects of the configuration files.</p> <p>For completeness, here is the complete traceback given:</p> <pre><code>Exception in Tkinter callback Traceback (most recent call last): File "C:\path\to\file\being\called\by\Tkinter.py", line 1081, in refresh self.canvas.draw() File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_tkagg.py", line 215, in draw FigureCanvasAgg.draw(self) File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py", line 314, in draw self.figure.draw(self.renderer) File "C:\Python25\Lib\site-packages\matplotlib\artist.py", line 46, in draw_wrapper draw(artist, renderer, *kl) File "C:\Python25\Lib\site-packages\matplotlib\figure.py", line 773, in draw for a in self.axes: a.draw(renderer) File "C:\Python25\Lib\site-packages\matplotlib\artist.py", line 46, in draw_wrapper draw(artist, renderer, *kl) File "C:\Python25\Lib\site-packages\matplotlib\axes.py", line 1735, in draw a.draw(renderer) File "C:\Python25\Lib\site-packages\matplotlib\artist.py", line 46, in draw_wrapper draw(artist, renderer, *kl) File "C:\Python25\Lib\site-packages\matplotlib\axis.py", line 742, in draw tick.draw(renderer) File "C:\Python25\Lib\site-packages\matplotlib\artist.py", line 46, in draw_wrapper draw(artist, renderer, *kl) File "C:\Python25\Lib\site-packages\matplotlib\axis.py", line 196, in draw self.label1.draw(renderer) File "C:\Python25\Lib\site-packages\matplotlib\text.py", line 515, in draw bbox, info = self._get_layout(renderer) File "C:\Python25\Lib\site-packages\matplotlib\text.py", line 279, in _get_layout clean_line, self._fontproperties, ismath=ismath) File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py", line 156, in get_text_width_height_descent self.mathtext_parser.parse(s, self.dpi, prop) File "C:\Python25\Lib\site-packages\matplotlib\mathtext.py", line 2797, in parse font_output = fontset_class(prop, backend) File "C:\Python25\Lib\site-packages\matplotlib\mathtext.py", line 658, in __init__ self._stix_fallback = StixFonts(*args, **kwargs) File "C:\Python25\Lib\site-packages\matplotlib\mathtext.py", line 900, in __init__ fullpath = findfont(name) File "C:\Python25\Lib\site-packages\matplotlib\font_manager.py", line 1306, in findfont if not os.path.exists(font): File "C:\Python25\lib\ntpath.py", line 255, in exists st = os.stat(path) TypeError: coercing to Unicode: need string or buffer, dict found </code></pre>

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