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charset is the input character set, and must be the canonical name of a
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the shortest of qp or base64 encoding, or None for no encoding. SHORTEST
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for a specific character set. It also provides convenience routines for
converting between character sets, given the availability of the
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information on how to use that character set in an email in an
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Certain character sets must be encoded with quoted-printable or base64
when used in email headers or bodies. Certain character sets must be
converted outright, and are not allowed in email. Instances of this
module expose the following information about a character set:
input_charset: The initial character set specified. Common aliases
are converted to their 'official' email names (e.g. latin_1
is converted to iso-8859-1). Defaults to 7-bit us-ascii.
header_encoding: If the character set must be encoded before it can be
used in an email header, this attribute will be set to
charset.QP (for quoted-printable), charset.BASE64 (for
base64 encoding), or charset.SHORTEST for the shortest of
QP or BASE64 encoding. Otherwise, it will be None.
body_encoding: Same as header_encoding, but describes the encoding for the
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output_charset: Some character sets must be converted before they can be
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charset output will be converted to. Otherwise, it will
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input_codec: The name of the Python codec used to convert the
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