René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"PDFPages Errors on savefig (missing encode)","articleBody":"With just a part of http://matplotlib.org/examples/pylab_examples/multipage_pdf.html\r\n```python\r\nfrom matplotlib.backends.backend_pdf import PdfPages\r\nimport matplotlib.pyplot as plt\r\n\r\nwith PdfPages('multipage_pdf.pdf') as pdf:\r\n    plt.figure(figsize=(3, 3))\r\n    plt.plot(range(7), [3, 1, 4, 1, 5, 9, 2], 'r-o')\r\n    plt.title('Page One')\r\n    pdf.savefig()  # saves the current figure into a pdf page\r\n    plt.close()\r\n```\r\n\r\nTraceback\r\n```\r\npdf.savefig()\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/backends/backend_pdf.py\", line 2462, in savefig\r\n    figure.savefig(self, format='pdf', **kwargs)\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/figure.py\", line 1572, in savefig\r\n    self.canvas.print_figure(*args, **kwargs)\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/backend_bases.py\", line 2245, in print_figure\r\n    **kwargs)\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/backends/backend_cairo.py\", line 483, in print_pdf\r\n    return self._save(fobj, 'pdf', *args, **kwargs)\r\n  File \"/usr/lib/python3/dist-packages/matplotlib/backends/backend_cairo.py\", line 516, in _save\r\n    surface = cairo.PDFSurface (fo, width_in_points, height_in_points)\r\n  File \"/usr/lib/python3/dist-packages/cairocffi/surfaces.py\", line 792, in __init__\r\n    _encode_filename(target), width_in_points, height_in_points)\r\n  File \"/usr/lib/python3/dist-packages/cairocffi/surfaces.py\", line 52, in _encode_filename\r\n    filename = filename.encode(sys.getfilesystemencoding())\r\nAttributeError: 'PdfPages' object has no attribute 'encode'\r\n```\r\n\r\nThe issue I see lies in ``Figure.savefig(self, *args, **kwargs)`` where Args get listed as:\r\n```\r\nArguments:\r\n\r\n*fname*:\r\nA string containing a path to a filename, or a Python\r\nfile-like object, or possibly some backend-dependent object\r\nsuch as :class:`~matplotlib.backends.backend_pdf.PdfPages`.\r\n```\r\nHowever the stack show above shows this \"filename\" passed down to cairosurfaces where it wants to encode the filename, which it can't do as it has a PDFPages object and not a filename.\r\n\r\nI have been looking through the tests and we don't seem to try to save any tests for this.  Maybe however this bug comes up only with the cairocffi.","author":{"url":"https://github.com/OceanWolf","@type":"Person","name":"OceanWolf"},"datePublished":"2017-08-28T05:36:59.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/9112/matplotlib/issues/9112"}