[issue7267] format method: c presentation type broken

[STINNER Victor]

STINNER Victor added the comment:

u'{0:c}'.format(256) calls 256.__format__('c') which returns a str (bytes) object, so we must reject value outside range(0, 256). The real fix for this issue is to upgrade to Python 3.

Attached patch works around the inital issue (u'{0:c}'.format(256)) by raising OverflowError on int.__format__('c') if the value is not in range(0, 256).

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Added file: http://bugs.python.org/file30747/int_format_c.patch

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<http://bugs.python.org/issue7267>
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