New submission from STINNER Victor <vstin...@redhat.com>:

The PEP 399 requires that C accelerator behaves exactly as Python, but a lot of 
C code truncates type name to an arbitrary length: 80, 100, 200, up to 500 (not 
sure if it's a number of bytes or characters).

Py_TYPE(obj)->tp_name is a common pattern: it would be nice to have a new "%T" 
format in PyUnicode_FromFormat(), so it can be used directly in PyErr_Format(), 
to format an object type name.

Attached PR implements the proposed %T format and modify unicodeobject.c to use 
it.

I propose to then write a second PR to modify all C code of CPython using 
Py_TYPE(obj)->tp_name to use the new %T type.

----------
components: Interpreter Core
messages: 324675
nosy: vstinner
priority: normal
severity: normal
status: open
title: PyUnicode_FromFormat(): add %T format for an object type name
versions: Python 3.8

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue34595>
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