Add new format of fixed length string for PyErr_Format

[vajrasky]

BPO	19984
Nosy	@warsaw, @pitrou, @serhiy-storchaka, @vajrasky
Files	add_T_format_for_PyErr_Format.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2013-12-15.05:23:22.415>
labels = ['interpreter-core', 'type-feature', '3.10']
title = 'Add new format of fixed length string for PyErr_Format'
updated_at = <Date 2021-02-15.20:05:44.863>
user = 'https://github.com/vajrasky'

bugs.python.org fields:

activity = <Date 2021-02-15.20:05:44.863>
actor = 'iritkatriel'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2013-12-15.05:23:22.415>
creator = 'vajrasky'
dependencies = []
files = ['33142']
hgrepos = []
issue_num = 19984
keywords = ['patch']
message_count = 2.0
messages = ['206216', '206232']
nosy_count = 4.0
nosy_names = ['barry', 'pitrou', 'serhiy.storchaka', 'vajrasky']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue19984'
versions = ['Python 3.10']

[vajrasky]

This ticket sprung from this discussion:
https://mail.python.org/pipermail/python-dev/2013-December/130756.html

Basically I am always confused when writing error message in C-API.

Is it:

PyErr_Format(PyExc_TypeError,"can't intern %.400s", s->ob_type->tp_name);

or

PyErr_Format(PyExc_TypeError,"can't intern %.80s", s->ob_type->tp_name);

or

PyErr_Format(PyExc_TypeError,"can't intern %s", s->ob_type->tp_name);

In conclusion, is it %s or %.80s or %.400s?

This patch will add one true way of writing fixed length string of the wrong type. This is just preliminary patch. I'll write the documentation later (and maybe test?).

[serhiy-storchaka]

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