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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Tkinter Canvas.coords does not flatten arguments","articleBody":"**Bug report**\r\nDouble nested arrays in tk.coords will produce errors in tkinter (`_tkinter.TclError: wrong # coordinates: expected at least 4, got 2` in this case)\r\n```py\r\nimport tkinter as tk\r\n\r\ncoords = [[100, 100], [300, 300]]\r\n\r\n\r\nroot = tk.Tk()\r\ncanvas = tk.Canvas(width=400,\r\n                   height=400,\r\n                   background=\"bisque\")\r\ncanvas.pack(fill=\"both\", expand=True)\r\nline = canvas.create_line(coords)\r\ncoords[1] = [200, 200]\r\ncanvas.coords(line, coords)  # line with error\r\n\r\nroot.mainloop()\r\n\r\n```\r\n\r\n**Your environment**\r\n\r\n- CPython versions tested on: 3.10.4\r\n- Operating system: Windows 10\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-98479\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/Why-not-now","@type":"Person","name":"Why-not-now"},"datePublished":"2022-07-01T06:17:48.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/94473/cpython/issues/94473"}