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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"codeop: inconsistent handling of invalid escapes","articleBody":"# Bug report\r\n\r\nIt seems like the `codeop` module is inconsistent with regards to handling of invalid escapes. For example, `'\\('` is accepted at the top level, but apparently not within indented blocks.\r\n\r\n```\r\nPython 3.10.4 (tags/v3.10.4:9d38120, Mar 23 2022, 23:13:41) [MSC v.1929 64 bit (AMD64)] on win32\r\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\r\n\u003e\u003e\u003e import codeop\r\n\u003e\u003e\u003e codeop.compile_command(\"'\\('\")\r\n\u003ccode object \u003cmodule\u003e at 0x00000244A5BE6290, file \"\u003cinput\u003e\", line 1\u003e\r\n\u003e\u003e\u003e codeop.compile_command(\"while False:\\n\\t'\\('\")\r\nTraceback (most recent call last):\r\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\r\n  File \"C:\\Users\\kevin\\AppData\\Local\\Programs\\Python\\Python310\\lib\\codeop.py\", line 107, in compile_command\r\n    return _maybe_compile(_compile, source, filename, symbol)\r\n  File \"C:\\Users\\kevin\\AppData\\Local\\Programs\\Python\\Python310\\lib\\codeop.py\", line 70, in _maybe_compile\r\n    compiler(source + \"\\n\", filename, symbol)\r\n  File \"C:\\Users\\kevin\\AppData\\Local\\Programs\\Python\\Python310\\lib\\codeop.py\", line 86, in _compile\r\n    return compile(source, filename, symbol, PyCF_DONT_IMPLY_DEDENT | PyCF_ALLOW_INCOMPLETE_INPUT)\r\n  File \"\u003cinput\u003e\", line 2\r\n    '\\('\r\n    ^^^^\r\nSyntaxError: invalid escape sequence '\\('\r\n```\r\n\r\nThis can also be seen when submitting code via IDLE; e.g.\r\n\r\n![Screenshot 2022-08-17 100851](https://user-images.githubusercontent.com/1976582/185203208-f199da02-ee43-4ae1-af95-3cbb119d3c42.jpg)\r\n\r\nHowever, such code is accepted by a \"plain\" Python terminal:\r\n\r\n![Screenshot 2022-08-17 102531](https://user-images.githubusercontent.com/1976582/185203475-5161b9e2-89c9-4726-b022-9436f4df14a2.jpg)\r\n\r\nGiven the discrepancy, it seems like invalid escapes should perhaps be accepted by `codeop` here?\r\n\r\n# Your environment\r\n\r\nPython 3.10.4 (tags/v3.10.4:9d38120, Mar 23 2022, 23:13:41) [MSC v.1929 64 bit (AMD64)] on win32\r\n","author":{"url":"https://github.com/kevinushey","@type":"Person","name":"kevinushey"},"datePublished":"2022-08-17T17:30:47.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/96052/cpython/issues/96052"}