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specified in the encoded string.
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| � d | _ d S)aD Create a MIME-compliant header that can contain many character sets.
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value is not set. You can later append to the header with .append()
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.append() documentation for semantics.
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charset argument to the .append() method. It also sets the default
character set for all subsequent .append() calls that omit the charset
argument. If charset is not provided in the constructor, the us-ascii
charset is used both as s's initial charset and as the default for
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header which isn't included in s, e.g. `Subject') pass in the name of
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syntactic breaks': split points preceded by a splitchar are preferred
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string to indicate whether preference should be given to one over the
other as a split point when other split chars do not appear in the line
being split. Splitchars does not affect RFC 2047 encoded lines.
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