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information on how to use that character set in an email in an
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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
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Charset.QP (for quoted-printable), Charset.BASE64 (for
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mail message's body, which indeed may be different than the
header encoding. Charset.SHORTEST is not allowed for
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used in email headers or bodies. If the input_charset is
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charset output will be converted to. Otherwise, it will
be None.
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necessary, this attribute will be None.
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