Message 324675 - Python tracker

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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.