René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Problem with Lualatex backend","articleBody":"### Bug report\r\n\r\nChanging the rcParams option `pgf.texsystem` to `lualatex` is not working in my installation (Ubuntu 18.04 with python 3.6 and latest version of `matplotlib` installed from `pip`).\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\n#!/usr/bin/env python\r\n# -*- coding: utf-8 -*-\r\nimport matplotlib as mpl\r\nimport matplotlib.pyplot as plt\r\nimport numpy as np\r\n\r\nmpl.use(\"pgf\")\r\npgf_with_lualatex = {\r\n    \"text.usetex\": True,\r\n    \"pgf.rcfonts\": False,\r\n    \"pgf.texsystem\": 'lualatex',\r\n    \"text.latex.preamble\": [\r\n        r\"\\usepackage{fontspec}\",\r\n        r\"\\setmainfont{Arial}\",\r\n    ],\r\n}\r\n\r\nmpl.rcParams.update(pgf_with_lualatex)\r\n\r\nfig = plt.figure()\r\nax = fig.add_subplot(111)\r\nax.plot(np.linspace(0,10,10), marker='o')\r\n\r\nfig.savefig('test.pdf')\r\n```\r\n\r\n**Actual outcome**\r\n\r\n```\r\n|| [python /home/tapiac/Dokumente/test_python.py]\r\n|| Traceback (most recent call last):\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/texmanager.py\", line 335, in _run_checked_subprocess\r\n||     stderr=subprocess.STDOUT)\r\n||   File \"/home/tapiac/.pyenv/versions/3.6.1/lib/python3.6/subprocess.py\", line 336, in check_output\r\n||     **kwargs).stdout\r\n||   File \"/home/tapiac/.pyenv/versions/3.6.1/lib/python3.6/subprocess.py\", line 418, in run\r\n||     output=stdout, stderr=stderr)\r\n|| subprocess.CalledProcessError: Command '['latex', '-interaction=nonstopmode', '--halt-on-error', '/home/tapiac/.cache/matplotlib/tex.cache/2d2af434dea92760ceaac4d24cdcd139.tex']' returned non-zero exit status 1.\r\n|| \r\n|| During handling of the above exception, another exception occurred:\r\n|| \r\n|| Traceback (most recent call last):\r\n||   File \"/home/tapiac/Dokumente/test_python.py\", line 25, in \u003cmodule\u003e\r\n||     fig.savefig('test.pdf')\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/figure.py\", line 2035, in savefig\r\n||     self.canvas.print_figure(fname, **kwargs)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/backend_bases.py\", line 2263, in print_figure\r\n||     **kwargs)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/backends/backend_pdf.py\", line 2586, in print_pdf\r\n||     self.figure.draw(renderer)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/artist.py\", line 55, in draw_wrapper\r\n||     return draw(artist, renderer, *args, **kwargs)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/figure.py\", line 1475, in draw\r\n||     renderer, self, artists, self.suppressComposite)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/image.py\", line 141, in _draw_list_compositing_images\r\n||     a.draw(renderer)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/artist.py\", line 55, in draw_wrapper\r\n||     return draw(artist, renderer, *args, **kwargs)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/axes/_base.py\", line 2607, in draw\r\n||     mimage._draw_list_compositing_images(renderer, self, artists)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/image.py\", line 141, in _draw_list_compositing_images\r\n||     a.draw(renderer)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/artist.py\", line 55, in draw_wrapper\r\n||     return draw(artist, renderer, *args, **kwargs)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/axis.py\", line 1192, in draw\r\n||     renderer)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/axis.py\", line 1130, in _get_tick_bboxes\r\n||     extent = tick.label1.get_window_extent(renderer)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/text.py\", line 922, in get_window_extent\r\n||     bbox, info, descent = self._get_layout(self._renderer)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/text.py\", line 300, in _get_layout\r\n||     ismath=False)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/backends/backend_pdf.py\", line 2148, in get_text_width_height_descent\r\n||     renderer=self)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/texmanager.py\", line 501, in get_text_width_height_descent\r\n||     dvifile = self.make_dvi(tex, fontsize)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/texmanager.py\", line 365, in make_dvi\r\n||     texfile], tex)\r\n||   File \"/home/tapiac/.virtualenvs/py36/lib/python3.6/site-packages/matplotlib/texmanager.py\", line 344, in _run_checked_subprocess\r\n||     exc=exc.output.decode('utf-8')))\r\n|| RuntimeError: latex was not able to process the following string:\r\n|| b'lp'\r\n|| \r\n|| Here is the full report generated by latex:\r\n|| This is pdfTeX, Version 3.14159265-2.6-1.40.18 (TeX Live 2017/Debian) (preloaded format=latex)\r\n||  restricted \\write18 enabled.\r\n|| entering extended mode\r\n|| (/home/tapiac/.cache/matplotlib/tex.cache/2d2af434dea92760ceaac4d24cdcd139.tex\r\n|| LaTeX2e \u003c2017-04-15\u003e\r\n|| Babel \u003c3.18\u003e and hyphenation patterns for 84 language(s) loaded.\r\n|| (/usr/share/texlive/texmf-dist/tex/latex/base/article.cls\r\n|| Document Class: article 2014/09/29 v1.4h Standard LaTeX document class\r\n|| (/usr/share/texlive/texmf-dist/tex/latex/base/size10.clo))\r\n|| (/usr/share/texlive/texmf-dist/tex/latex/type1cm/type1cm.sty)\r\n|| (/usr/share/texlive/texmf-dist/tex/latex/base/textcomp.sty\r\n|| (/usr/share/texlive/texmf-dist/tex/latex/base/ts1enc.def))\r\n|| (/usr/share/texlive/texmf-dist/tex/latex/fontspec/fontspec.sty\r\n|| (/usr/share/texlive/texmf-dist/tex/latex/l3packages/xparse/xparse.sty\r\n|| (/usr/share/texlive/texmf-dist/tex/latex/l3kernel/expl3.sty\r\n|| (/usr/share/texlive/texmf-dist/tex/latex/l3kernel/expl3-code.tex)\r\n|| (/usr/share/texlive/texmf-dist/tex/latex/l3kernel/l3dvips.def)))\r\n|| \r\n|| !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\r\n|| !\r\n|| ! Fatal fontspec error: \"cannot-use-pdftex\"\r\n|| ! \r\n|| ! The fontspec package requires either XeTeX or LuaTeX.\r\n|| ! \r\n|| ! You must change your typesetting engine to, e.g., \"xelatex\" or\r\n|| ! \"lualatex\"instead of \"latex\" or \"pdflatex\".\r\n|| ! \r\n|| ! See the fontspec\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e\r\n\u003c!--If you installed from conda, please specify which channel you used if not the default--\u003e documentation for further information.\r\n|| ! \r\n|| ! For immediate help type H \u003creturn\u003e.\r\n|| !...............................................  \r\n||                                                   \r\n|| l.44 \\msg_fatal:nn {fontspec} {cannot-use-pdftex}\r\n||                                                  \r\n|| No pages of output.\r\n|| Transcript written on 2d2af434dea92760ceaac4d24cdcd139.log.\r\n|| \r\n|| \r\n\r\n```\r\n\r\n**Expected outcome**\r\n\r\nA pdf version of the plot generated with Lualatex.\r\n\r\n**Matplotlib version**\r\n\r\n  * Operating system: Ubuntu 18.04\r\n  * Matplotlib version: 2.2.2\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): TkAgg\r\n  * Python version: 3.6\r\n\r\nI installed python in a virtual environment and then installed matplotlib with `pip`.\r\n\r\n","author":{"url":"https://github.com/cristobaltapia","@type":"Person","name":"cristobaltapia"},"datePublished":"2018-06-20T16:48:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/11463/matplotlib/issues/11463"}