PGF/Tikz: savefig could not handle a filename

[sciunto]

Hi,

I'm very enthousiastic with the new PGF/Tikz support. Thanks for that!

Installed from the github (master) repository via https://aur.archlinux.org/packages.php?ID=54712, I could not use in
savefig(fname, dpi=None, facecolor='w', edgecolor='w',
orientation='portrait', papertype=None, format=None,
transparent=False, bbox_inches=None, pad_inches=0.1)

fname as "A string containing a path to a filename" if the pgf backend is loaded.

Short snippet to reproduce

plot(sin(linspace(10,20)), 'o')
savefig('a.pgf')

whereas it works for other formats.

This is the traceback

TypeError                                 Traceback (most recent call last)
<ipython-input-9-1fb1eacfdd2b> in <module>()
----> 1 plt.savefig('a.pgf')

/usr/lib/python3.2/site-packages/matplotlib/pyplot.py in savefig(*args, **kwargs)
    473 def savefig(*args, **kwargs):
    474     fig = gcf()
--> 475     return fig.savefig(*args, **kwargs)
    476
    477 @docstring.copy_dedent(Figure.ginput)

/usr/lib/python3.2/site-packages/matplotlib/figure.py in savefig(self, *args, **kwargs)
   1266             kwargs.setdefault('edgecolor', rcParams['savefig.edgecolor'])
   1267
-> 1268         self.canvas.print_figure(*args, **kwargs)
   1269
   1270         if transparent:

/usr/lib/python3.2/site-packages/matplotlib/backend_bases.py in print_figure(self, filename, dpi, facecolor, edgecolor, orienta
tion, format, **kwargs)
   2087                 orientation=orientation,
   2088                 bbox_inches_restore=_bbox_inches_restore,
-> 2089                 **kwargs)
   2090         finally:
   2091             if bbox_inches and restore_bbox:

/usr/lib/python3.2/site-packages/matplotlib/backend_bases.py in print_pgf(self, *args, **kwargs)
   1846         from .backends.backend_pgf import FigureCanvasPgf # lazy import
   1847         pgf = self.switch_backends(FigureCanvasPgf)
-> 1848         return pgf.print_pgf(*args, **kwargs)
   1849
   1850     def print_png(self, *args, **kwargs):

/usr/lib/python3.2/site-packages/matplotlib/backends/backend_pgf.py in print_pgf(self, filename, *args, **kwargs)
    672             writeln(fh, r"\pgfusepath{use as bounding box}")
    673
--> 674             renderer = RendererPgf(self.figure, fh)
    675             self.figure.draw(renderer)
    676

/usr/lib/python3.2/site-packages/matplotlib/backends/backend_pgf.py in __init__(self, figure, fh)
    356
    357         # get LatexManager instance
--> 358         self.latexManager = LatexManagerFactory.get_latex_manager()
    359
    360     def draw_markers(self, gc, marker_path, marker_trans, path, trans, rgbFace=None):

/usr/lib/python3.2/site-packages/matplotlib/backends/backend_pgf.py in get_latex_manager()
    203             if rcParams.get("pgf.debug", False):
    204                 print("creating LatexManager")
--> 205             new_inst = LatexManager()
    206             LatexManagerFactory.previous_instance = new_inst
    207             return new_inst


/usr/lib/python3.2/site-packages/matplotlib/backends/backend_pgf.py in __init__(self)
    241                                   stdout=subprocess.PIPE,
    242                                   universal_newlines=True)
--> 243         stdout, stderr = latex.communicate(self.latex_header + latex_end)
    244         if latex.returncode != 0:
    245             raise LatexError("LaTeX returned an error, probably missing font or error in preamble:\n%s" % stdout)

/usr/lib/python3.2/subprocess.py in communicate(self, input)
    817             return (stdout, stderr)
    818 
--> 819         return self._communicate(input)
    820 
    821 

/usr/lib/python3.2/subprocess.py in _communicate(self, input)
   1423 
   1424             if _has_poll:
-> 1425                 stdout, stderr = self._communicate_with_poll(input)
   1426             else:
   1427                 stdout, stderr = self._communicate_with_select(input)

/usr/lib/python3.2/subprocess.py in _communicate_with_poll(self, input)
   1490                         chunk = input[input_offset : input_offset + _PIPE_BUF]
   1491                         try:
-> 1492                             input_offset += os.write(fd, chunk)
   1493                         except OSError as e:
   1494                             if e.errno == errno.EPIPE:

TypeError: 'str' does not support the buffer interface

[sciunto]

oops, I just became aware of #1118