René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"test_backend.pgf.check_for(texsystem) does not do what it says...","articleBody":"```\ndef check_for(texsystem): #\u003c- different commands are asked for, but not actually checked below...\n    header = \"\"\"\n    \\\\documentclass{minimal}\n    \\\\usepackage{pgf}\n    \\\\begin{document}\n    \\\\typeout{pgfversion=\\\\pgfversion}\n    \\\\makeatletter\n    \\\\@@end\n    \"\"\"\n    try:\n        latex = subprocess.Popen([\"xelatex\", \"-halt-on-error\"], #\u003c- why not texsystem? \n                                 stdin=subprocess.PIPE,\n                                 stdout=subprocess.PIPE)\n        stdout, stderr = latex.communicate(header.encode(\"utf8\"))\n    except OSError:\n        return False\n\n    return latex.returncode == 0\n```\n\nNot sure if thats on purpose, but if so it should be documented...\n","author":{"url":"https://github.com/jankatins","@type":"Person","name":"jankatins"},"datePublished":"2016-01-26T19:59:49.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/5921/matplotlib/issues/5921"}