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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Tcl_AsyncDelete: async handler deleted by the wrong thread","articleBody":"Using matploy throught pyplot when I quit my application I've the message :\r\n\r\n```\r\nException ignored in: \u003cfunction Image.__del__ at 0x7fb34d3e4268\u003e\r\nTraceback (most recent call last):\r\n  File \"/usr/lib/python3.7/tkinter/__init__.py\", line 3504, in __del__\r\nRuntimeError: main thread is not in main loop\r\nTcl_AsyncDelete: async handler deleted by the wrong thread\r\nAbandon\r\n```\r\n\r\nI do the stuff into a separate thread because I want my primary thread to be responsive, no gui etc... I have only the default created figure and I've tryed to call plt.close() close('all') before the thread terminate.\r\n\r\nIt seems there is a static method in _backend_tk.py wich manage the mainloop, I've not followed all the code, but it seems it try to cleanup the rest at program exit.\r\n\r\nIs there a way to make Tk and Tcl fully destroyed into my GUI thread ?\r\n\r\n```\r\nimport time\r\nimport threading\r\nimport matplotlib.pyplot as plt\r\n\r\n\r\nclass MyThread(threading.Thread):\r\n\r\n\tdef __init__(self):\r\n\t\tsuper().__init__()\r\n\r\n\tdef run(self):\r\n\t\tplt.ion()\r\n\r\n\t\twhile self._running:\r\n\t\t\tfig = plt.gcf()\r\n\t\t\tfig.clear()\r\n\r\n\t\t\tplt.show(block=False)\r\n\t\t\tplt.pause(0.1)\r\n\r\n\t\tplt.ioff()\r\n\t\tplt.close('all')\r\n\r\nmy_thread = MyThread()\r\n\r\nmy_thread.setDaemon(True)\r\nmy_thread._running = True\r\nmy_thread.start()\r\n\r\ntime.sleep(2)\r\nmy_thread._running = False\r\n\r\nmy_thread.join()\r\n```\r\n","author":{"url":"https://github.com/firebird631","@type":"Person","name":"firebird631"},"datePublished":"2018-09-10T23:49:35.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/12085/matplotlib/issues/12085"}