[issue7649] "u'%c' % char" broken for chars in range '\x80'-'\xFF'

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

> Could you please check for chars above 0x7f first and then use
> PyUnicode_Decode() instead of the PyUnicode_FromStringAndSize() API

I concur: PyUnicode_FromStringAndSize() decodes with utf-8 whereas the expected conversion char->unicode should use the default encoding (ascii).
But why is it necessary to check for chars above 0x7f?

> (this API should not have been backported from the Python 3.x
> in Python 2.6,
This function is still useful when the chars come from a C string literal in the source code (btw there should be something about the encoding used in C files). But it's not always correctly used even in 3.x, in posixmodule.c for example.

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nosy: +amaury.forgeotdarc

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