New submission from Emanuel Barry: Attached patch deprecates invalid escape sequences in unicode strings. The point of this is to prevent issues such as #27356 (and possibly other similar ones) in the future.
Without the patch: >>> "hello \world" 'hello \\world' With the patch: >>> "hello \world" DeprecationWarning: invalid escape sequence 'w' I'll need some help (patch isn't mergeable yet): test_doctest fails on my machine with the patch (and -W), and I don't know how to fix it. test_ast fails an assertion (!PyErr_Occurred() in PyObject_Call in abstract.c) when -W is on, and I also don't know how to fix it (I don't even know what causes it). Of course, I went ahead and fixed all instances of invalid escape sequences in the stdlib (that I could find) so that no DeprecationWarning is encountered. Lastly, I thought about also doing this to bytes, but I ran into some issues with some invalid escapes such as \u, and _codecs.escape_decode would trigger the warning when passed br"\8" (for example). Ultimately, I decided to leave bytes alone for now, since it's mostly on the lower-level side of things. If there's interest I can add it back. ---------- components: Interpreter Core, Library (Lib), Unicode files: deprecate_invalid_unicode_escapes.patch keywords: patch messages: 269022 nosy: ebarry, ezio.melotti, haypo priority: normal severity: normal stage: patch review status: open title: Deprecate invalid unicode escape sequences type: behavior versions: Python 3.6 Added file: http://bugs.python.org/file43499/deprecate_invalid_unicode_escapes.patch _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue27364> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
