[issue19984] Add new format of fixed length string for PyErr_Format

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Originally Antoine had proposed [1] `"%T", obj` as replacement for `"%.400s", Py_TYPE(obj)->tp_name`.

[1] http://permalink.gmane.org/gmane.comp.python.devel/143925

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nosy: +pitrou, serhiy.storchaka

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