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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"sqlite3.Row.__hash__ raises SystemError instead of TypeError for an unhashable value","articleBody":"### Bug description\n\n`sqlite3.Row.__hash__` calls `PyObject_Hash` on the row's description and data\nwithout checking the `-1` error return, so hashing a row that holds an\nunhashable value raises `SystemError` instead of `TypeError`:\n\n```python\nimport sqlite3\nsqlite3.register_converter(\"LST\", lambda b: [1, 2, 3])\ncon = sqlite3.connect(\":memory:\", detect_types=sqlite3.PARSE_DECLTYPES)\ncon.row_factory = sqlite3.Row\ncon.execute(\"create table t(x LST)\")\ncon.execute(\"insert into t values (?)\", (b\"x\",))\nrow = con.execute(\"select x from t\").fetchone()\nhash(row)\n# SystemError: \u003cbuilt-in function hash> returned a result with an exception set\n```\n\nExpected: `TypeError: unhashable type: 'list'`.\n\n### CPython versions tested on\n\n3.14, 3.15, 3.16\n\n### Operating systems tested on\n\nmacOS\n\n\n\u003c!-- gh-linked-prs -->\n### Linked PRs\n* gh-153696\n* gh-153723\n* gh-153724\n* gh-153725\n\u003c!-- /gh-linked-prs -->\n","author":{"url":"https://github.com/tonghuaroot","@type":"Person","name":"tonghuaroot"},"datePublished":"2026-07-14T12:07:48Z","url":"https://github.com/python/cpython/issues/153695"}