Package: python3-matplotlib Version: 3.6.3-1+b1 Severity: important I have this tiny script which generates a silly graph of cryptographic primitives here:
https://gitlab.com/anarcat/crypto-bench/-/blob/master/benchdiceware.py The details are rather irrelevant here, but it eventually does this: plt.savefig(args.output, format=args.output.name[-3:]) ... which is basically: plt.savefig("foo.png", "png") This used to work fine in Python 2. Now that we switched to Python 3, this explodes with: anarcat@angela:crypto-bench$ ./benchpasswords.py -o benchdiceware.png Traceback (most recent call last): File "/home/anarcat/src/crypto-bench/./benchpasswords.py", line 102, in <module> render_graph(args.output) File "/home/anarcat/src/crypto-bench/./benchpasswords.py", line 90, in render_graph plt.savefig(args.output, File "/usr/lib/python3/dist-packages/matplotlib/pyplot.py", line 959, in savefig res = fig.savefig(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/matplotlib/figure.py", line 3285, in savefig self.canvas.print_figure(fname, **kwargs) File "/usr/lib/python3/dist-packages/matplotlib/backend_bases.py", line 2338, in print_figure result = print_method( ^^^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/matplotlib/backend_bases.py", line 2204, in <lambda> print_method = functools.wraps(meth)(lambda *args, **kwargs: meth( ^^^^^ File "/usr/lib/python3/dist-packages/matplotlib/_api/deprecation.py", line 410, in wrapper return func(*inner_args, **inner_kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_agg.py", line 517, in print_png self._print_pil(filename_or_obj, "png", pil_kwargs, metadata) File "/usr/lib/python3/dist-packages/matplotlib/backends/backend_agg.py", line 464, in _print_pil mpl.image.imsave( File "/usr/lib/python3/dist-packages/matplotlib/image.py", line 1667, in imsave image.save(fname, **pil_kwargs) File "/usr/lib/python3/dist-packages/PIL/Image.py", line 2431, in save save_handler(self, fp, filename) File "/usr/lib/python3/dist-packages/PIL/PngImagePlugin.py", line 1307, in _save fp.write(_MAGIC) TypeError: write() argument must be str, not bytes anarcat@angela:crypto-bench[1]$ It looks like matplotlib is calling PIL wrong. Or PIL is wrong itself, I'm not sure where to lay the blame here... a. -- System Information: Debian Release: 12.0 APT prefers testing-security APT policy: (500, 'testing-security'), (500, 'testing-debug'), (500, 'stable-security'), (500, 'testing'), (500, 'stable'), (1, 'experimental'), (1, 'unstable') Architecture: amd64 (x86_64) Kernel: Linux 6.1.0-7-amd64 (SMP w/16 CPU threads; PREEMPT) Locale: LANG=fr_CA.UTF-8, LC_CTYPE=fr_CA.UTF-8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages python3-matplotlib depends on: ii libc6 2.36-9 ii libfreetype6 2.12.1+dfsg-5 ii libgcc-s1 12.2.0-14 ii libjs-jquery 3.6.1+dfsg+~3.5.14-1 ii libjs-jquery-ui 1.13.2+dfsg-1 ii libqhull-r8.0 2020.2-5 ii libstdc++6 12.2.0-14 ii python-matplotlib-data 3.6.3-1 ii python3 3.11.2-1+b1 ii python3-contourpy 1.0.7-1+b1 ii python3-cycler 0.11.0-1 ii python3-dateutil 2.8.2-2 ii python3-fonttools 4.38.0-1+b1 ii python3-kiwisolver 1.4.4-1+b1 ii python3-numpy [python3-numpy-abi9] 1:1.24.2-1 ii python3-packaging 23.0-1 ii python3-pil 9.4.0-1.1+b1 ii python3-pil.imagetk 9.4.0-1.1+b1 ii python3-pyparsing 3.0.9-1 ii python3-six 1.16.0-4 Versions of packages python3-matplotlib recommends: ii python3-tk 3.10.8-1 Versions of packages python3-matplotlib suggests: ii cm-super-minimal 0.3.4-17 pn dvipng <none> ii ffmpeg 7:5.1.2-3 pn fonts-staypuft <none> ii ghostscript 10.0.0~dfsg-11 ii gir1.2-gtk-3.0 3.24.37-2 ii inkscape 1.2.2-2+b1 ii ipython3 8.5.0-4 ii librsvg2-common 2.54.5+dfsg-1 pn python3-cairocffi <none> ii python3-gi 3.42.2-3+b1 ii python3-gi-cairo 3.42.2-3+b1 pn python3-gobject <none> ii python3-pyqt5 5.15.9+dfsg-1 ii python3-scipy 1.10.1-2 ii python3-sip 4.19.25+dfsg-5+b1 ii python3-tornado 6.2.0-3 pn texlive-extra-utils <none> ii texlive-latex-extra 2022.20230122-3 -- no debconf information
