René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[C API] Provide a replacement for removed private _Py_Identifier API, or consider reverting the removal","articleBody":"In Python 3.13, the private _Py_Identifier API was removed: see PR #108593.\r\n\r\nReplacements:\r\n\r\n* Use a literal bytes string: replace `\u0026PyId_abc` with `\"abc\"`, use \"String\" variant functions. Slower, but works on all Python versions. This solution can be used on code which is not *performance sensitive*.\r\n* Initialize a global or \"static\" variable to only create a Python str object once using `PyUnicode_FromString()`: less convenient, not compatible with multi-phase init API (PEP 489), not compatible with [PEP 684 – A Per-Interpreter GIL](https://peps.python.org/pep-0684/).\r\n\r\nIf we want to add a **public** API for this, I would prefer to only add the bare minimum API, make it as small as possible:\r\n\r\n* `Py_IDENTIFIER(name)` macro.\r\n* `PyUnicode_FromId(\u0026PyId_name)` function.\r\n* `Py_Identifier` structure with public members (needed by `Py_IDENTIFIER()` macro).\r\n* *Maybe* also: `Py_static_string(name, \"...\")` macro for strings which are not valid C identifiers.\r\n\r\nIt means that `_PyObject_GetAttrId(obj, \u0026PyId_abc)` must be replaced with:\r\n\r\n```c\r\nPyObject *name = PyUnicode_FromId(\u0026Py_abc);\r\nif (name == NULL) { ... handle error... }\r\nattr = PyObject_GetAttr(obj, name);\r\n```\r\n\r\nSince functions like PyObject_GetAttr() don't accept NULL, so you cannot simply write:\r\n\r\n```c\r\nattr = PyObject_GetAttr(obj, PyUnicode_FromId(\u0026Py_abc));\r\n```\r\n\r\n\r\nSee discussion:\r\n\r\n* https://discuss.python.org/t/c-api-how-much-private-is-the-private-py-identifier-api/29190 (July 2023)\r\n* https://mail.python.org/archives/list/python-dev@python.org/thread/DNMZAMB4M6RVR76RDZMUK2WRLI6KAAYS/ (Feb 2022)","author":{"url":"https://github.com/vstinner","@type":"Person","name":"vstinner"},"datePublished":"2023-10-30T10:37:00.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/111484/cpython/issues/111484"}