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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"mimetypes.guess_extension : AttributeError: 'NoneType' object has no attribute 'lower'","articleBody":"Hi, when i call the function \"guess_extension\" from the mimetypes module, i get an error : \r\n```\r\nTraceback (most recent call last):\r\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\r\n  File \"/home/hg/Bureau/ezConverter/module.py\", line 14, in getRealExtension\r\n    currentext = mime.guess_extension(x[0])\r\n  File \"/usr/lib/python3.9/mimetypes.py\", line 326, in guess_extension\r\n    return _db.guess_extension(type, strict)\r\n  File \"/usr/lib/python3.9/mimetypes.py\", line 192, in guess_extension\r\n    extensions = self.guess_all_extensions(type, strict)\r\n  File \"/usr/lib/python3.9/mimetypes.py\", line 171, in guess_all_extensions\r\n    type = type.lower()\r\nAttributeError: 'NoneType' object has no attribute 'lower'\r\n```\r\n\r\nI dont think it's my code. But it is here : \r\n```\r\nimport mimetypes as mime\r\ndef getRealExtension(filename):\r\n    x = mime.guess_type(filename)\r\n    currentext = mime.guess_extension(x[0])\r\n# I import it to the shell and call the function.\r\n```\r\nThanks in advance !","author":{"url":"https://github.com/HGStyle","@type":"Person","name":"HGStyle"},"datePublished":"2022-08-25T11:30:56.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/96264/cpython/issues/96264"}