[issue2799] Remove PyUnicode_AsString(), rework PyUnicode_AsStringAndSize(), add PyUnicode_AsChar()

[John Ehresman]

John Ehresman <jpe at wingware.com> added the comment:

I'm trying to port an existing C extension to py3k and find myself wanting something like PyUnicode_AsString so I don't need to introduce other objects to do memory management.  PyUnicode_AsString is equivalent to PyArg_Parse w/ a 's' format code, which I find hard to believe will be removed.  Another bug proposes changing the name and passing in a default value, which may be a good idea.

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nosy: +jpe

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