STINNER Victor <[email protected]> added the comment:
Py_TYPE() is commonly used to render the type name in an error message. Example:
PyErr_Format(PyExc_TypeError,
"cannot convert '%.200s' object to bytearray",
Py_TYPE(arg)->tp_name);
This code has multiple issues:
* It truncates type name to 200 characters: there is no Python exception, not
even a marker to indicate that the string has been truncated
* It's only the short name: the qualified name (tp_qualname) would be more
helpful. The best would be to generate the fully qualified name: module +
qualname.
* Py_TYPE() returns a borrowed reference which is causing multiple issues:
https://pythoncapi.readthedocs.io/bad_api.html#borrowed-references
In September 2018, I created bpo-34595: "PyUnicode_FromFormat(): add %T format
for an object type name". But there was disagreement, so I rejected my change.
I started "bpo-34595: How to format a type name?" thread on python-dev:
*
https://mail.python.org/archives/list/[email protected]/thread/HKYUMTVHNBVB5LJNRMZ7TPUQKGKAERCJ/#3UAMHYG6UF4MPLXBZORHO4JVKUBRUZ53
I didn't continue this work (until now), since it wasn't my priority.
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<https://bugs.python.org/issue39573>
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