importmatplotlib.pyplotaspltimportmatplotlibasmpl# remove or set to True (default) to trigger exceptionrc_xelatex= {'pgf.rcfonts':False}mpl.rcParams.update(rc_xelatex)plt.plot([1,2,3,4],label="$test$")# adding latex labelplt.legend(loc='right')# add to plotplt.show()# worksplt.savefig("latex_pyplot.pdf")# worksplt.savefig("latex_pyplot.pgf")# exception if pgf.rcfonts is True

kpathsea:make_tex: Invalid fontname `Bitstream Vera Serif', contains ' 'Traceback (most recent call last):  File "latex_pyplot.py", line 16, in <module>    plt.savefig("latex_pyplot.pgf")  # exception if pgf.rcfonts is True  File "/Users/jens/dev/matplotlib/lib/matplotlib/pyplot.py", line 710, in savefig    res = fig.savefig(*args, **kwargs)  File "/Users/jens/dev/matplotlib/lib/matplotlib/figure.py", line 1883, in savefig    self.canvas.print_figure(fname, **kwargs)  File "/Users/jens/dev/matplotlib/lib/matplotlib/backend_bases.py", line 2261, in print_figure    **kwargs)  File "/Users/jens/dev/matplotlib/lib/matplotlib/backends/backend_pgf.py", line 834, in print_pgf    self._print_pgf_to_fh(fh, *args, **kwargs)  File "/Users/jens/dev/matplotlib/lib/matplotlib/backends/backend_pgf.py", line 813, in _print_pgf_to_fh    RendererPgf(self.figure, fh),  File "/Users/jens/dev/matplotlib/lib/matplotlib/backends/backend_pgf.py", line 417, in __init__    self.latexManager = LatexManagerFactory.get_latex_manager()  File "/Users/jens/dev/matplotlib/lib/matplotlib/backends/backend_pgf.py", line 229, in get_latex_manager    new_inst = LatexManager()  File "/Users/jens/dev/matplotlib/lib/matplotlib/backends/backend_pgf.py", line 313, in __init__    raise LatexError("LaTeX returned an error, probably missing font or error in preamble:\n%s" % stdout)matplotlib.backends.backend_pgf.LatexError: LaTeX returned an error, probably missing font or error in preamble:This is XeTeX, Version 3.14159265-2.6-0.99998 (TeX Live 2017) (preloaded format=xelatex) restricted \write18 enabled.**entering extended modeLaTeX2e <2017-04-15>Babel <3.16> and hyphenation patterns for 84 language(s) loaded.*(/usr/local/texlive/2017/texmf-dist/tex/latex/base/minimal.clsDocument Class: minimal 2001/05/25 Standard LaTeX minimal class)(Please type a command or say `\end')**(/usr/local/texlive/2017/texmf-dist/tex/latex/fontspec/fontspec.sty(/usr/local/texlive/2017/texmf-dist/tex/latex/l3packages/xparse/xparse.sty(/usr/local/texlive/2017/texmf-dist/tex/latex/l3kernel/expl3.sty(/usr/local/texlive/2017/texmf-dist/tex/latex/l3kernel/expl3-code.tex)(/usr/local/texlive/2017/texmf-dist/tex/latex/l3kernel/l3xdvipdfmx.def)))(/usr/local/texlive/2017/texmf-dist/tex/latex/fontspec/fontspec-xetex.sty(/usr/local/texlive/2017/texmf-dist/tex/latex/base/fontenc.sty(/usr/local/texlive/2017/texmf-dist/tex/latex/base/tuenc.def))(/usr/local/texlive/2017/texmf-dist/tex/latex/fontspec/fontspec.cfg)))!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! fontspec error: "font-not-found"! ! The font "Bitstream Vera Serif" cannot be found.! ! See the fontspec documentation for further information.! ! For immediate help type H <return>.!...............................................                         <*> \setmainfont{Bitstream Vera Serif}No pages of output.Transcript written on texput.log.

.../opt/X11/share/fonts/TTF/VeraMoBI.ttf: Bitstream Vera Sans Mono:style=Bold Oblique/usr/X11R6/lib/X11/fonts/TTF/VeraIt.ttf: Bitstream Vera Sans:style=Oblique/opt/X11/share/fonts/TTF/Vera.ttf: Bitstream Vera Sans:style=Roman/usr/X11R6/lib/X11/fonts/TTF/VeraMoBd.ttf: Bitstream Vera Sans Mono:style=Bold/opt/X11/share/fonts/TTF/VeraMoIt.ttf: Bitstream Vera Sans Mono:style=Oblique/opt/X11/share/fonts/TTF/VeraSe.ttf: Bitstream Vera Serif:style=Roman/opt/X11/share/fonts/TTF/VeraMono.ttf: Bitstream Vera Sans Mono:style=Roman/usr/X11R6/lib/X11/fonts/TTF/VeraSe.ttf: Bitstream Vera Serif:style=Roman/opt/X11/share/fonts/TTF/VeraIt.ttf: Bitstream Vera Sans:style=Oblique/usr/X11R6/lib/X11/fonts/TTF/Vera.ttf: Bitstream Vera Sans:style=Roman/usr/X11R6/lib/X11/fonts/TTF/VeraMoBI.ttf: Bitstream Vera Sans Mono:style=Bold Oblique/usr/X11R6/lib/X11/fonts/TTF/VeraBI.ttf: Bitstream Vera Sans:style=Bold Oblique/usr/X11R6/lib/X11/fonts/TTF/VeraMono.ttf: Bitstream Vera Sans Mono:style=Roman/usr/X11R6/lib/X11/fonts/TTF/VeraBd.ttf: Bitstream Vera Sans:style=Bold/usr/X11R6/lib/X11/fonts/TTF/VeraSeBd.ttf: Bitstream Vera Serif:style=Bold/opt/X11/share/fonts/TTF/VeraBd.ttf: Bitstream Vera Sans:style=Bold/opt/X11/share/fonts/TTF/VeraSeBd.ttf: Bitstream Vera Serif:style=Bold/opt/X11/share/fonts/TTF/VeraMoBd.ttf: Bitstream Vera Sans Mono:style=Bold/opt/X11/share/fonts/TTF/VeraBI.ttf: Bitstream Vera Sans:style=Bold Oblique/usr/X11R6/lib/X11/fonts/TTF/VeraMoIt.ttf: Bitstream Vera Sans Mono:style=Oblique...