[issue5902] Stricter codec names

[Matthew Barnett]

Matthew Barnett <python at mrabarnett.plus.com> added the comment:

How about a 'full' form and a 'key' form generated by the function:

def codec_key(name):
    return name.lower().replace("-", "").replace("_", "")

The key form would be the key to an available codec, and the key
generated by a user-supplied codec name would have to match one of those
keys.

For example:

Full: "UTF-8", key: "utf8".

Full: "ISO-8859-1", key: "iso88591".

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nosy: +mrabarnett

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<http://bugs.python.org/issue5902>
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