Stéphane Blondon <stephane.blon...@gmail.com> added the comment: I'm interested by such feature.
I see examples of versions of the message provided by KeyError: - sometimes with a message (for example `PyErr_SetString(PyExc_KeyError, "name too long");` at [1]) - sometimes with the missing key (for example `PyErr_SetObject(PyExc_KeyError, key);` at [2]) It explains why there is a difference in the messages in KeyError (as said in previous messages). PyErr_SetString(), PyErr_Format(), PyErr_FormatV() (implemented in Python/errors.c) don't have a parameter to set the missing key. So I think it would be easier to set the missing attribute before calling thoses functions. According to [3], the C PyExc_KeyError matches the Python KeyError exception. So I think to: - Add a 'missing_key' attribute to KeyError_str (in [4]) - Add the missing key to PyExc_KeyError instance before the call of PyErr_SetString(), PyErr_SetObject(), etc. Do you think such strategy is doable? What do you think about it? Is it the way you think about it? If not, do you have some hint? I already made some minor patches to cpython but only in the Python part, never in C one. 1: https://github.com/python/cpython/blob/master/Modules/unicodedata.c#L1398 2: https://github.com/python/cpython/blob/master/Python/hamt.c#L2767 3: https://docs.python.org/3/c-api/exceptions.html?highlight=pyerr_format#standard-exceptions 4: https://github.com/python/cpython/blob/master/Objects/exceptions.c#L1569 ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue18163> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
