René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"keypad number presses not properly registered by tk","articleBody":"\u003c!--To help us understand and resolve your issue, please fill out the form to the best of your ability.--\u003e\r\n\u003c!--You can feel free to delete the sections that do not apply.--\u003e\r\n\r\n### Bug report\r\n\r\n**Bug summary**\r\n\r\nPressing keypad numbers do not report keys correctly under tkagg+linux, if numlock is active (i.e. when numbers should be reported); numbers are incorrectly reported when numlock is inactive (i.e. when numbers should *not* be reported).\r\n\r\n**Code for reproduction**\r\n\r\n`MPLBACKEND=tkagg python -c 'from pylab import *; gcf().canvas.mpl_connect(\"key_press_event\", lambda event: print(event.key)); show()'`\r\n\r\n**Actual outcome**\r\n\r\nnumbers are printed when numlock is inactive, and vice versa.\r\n\r\n**Expected outcome**\r\n\r\nthe opposite\r\n\r\n**Matplotlib version**\r\n\u003c!--Please specify your platform and versions of the relevant libraries you are using:--\u003e\r\n  * Operating system: ubuntu\r\n  * Matplotlib version: 2.0.2 (but likely irrelevant\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): tkagg\r\n  * Python version: 3.6\r\n  * Jupyter version (if applicable):\r\n  * Other libraries: \r\n\r\n\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\r\n\r\nThis is due to FigureCanvasTkAgg.keyvald using incorrect values for the mapping: it uses the values at http://infohost.nmt.edu/tcc/help/pubs/tkinter/web/key-names.html (KP_0, etc.) but the correct values (in the tk sources themselves...) are at https://github.com/tcltk/tk/blame/a1577313301d5ad9a6e553b359f7e5de2b8f6153/generic/ks_names.h (themselves derived from https://cgit.freedesktop.org/xorg/proto/x11proto/plain/keysymdef.h) and suggests that the numlock state got inverted.\r\n\r\nOn Windows this is irrelevant, keypad presses are reported with a keyval_sym \u003c256 and thus directly converted via ASCII to the correct value.  Not sure about the situation under OSX.","author":{"url":"https://github.com/anntzer","@type":"Person","name":"anntzer"},"datePublished":"2017-10-20T18:54:13.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":14},"url":"https://github.com/9493/matplotlib/issues/9493"}