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specified in the encoded string.
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decode_header() takes a header value string and returns a sequence of
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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()
method calls. s may be a byte string or a Unicode string, but see the
.append() documentation for semantics.
Optional charset serves two purposes: it has the same meaning as the
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
subsequent .append() calls.
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splitting the first line to a shorter value (to account for the field
header which isn't included in s, e.g. `Subject') pass in the name of
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charset is a hint specifying the character set of the characters in
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75-character length limit on any given encoded header field, so
line-wrapping must be performed, even with double-byte character sets.
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name was specified at Header construction time. The default value for
maxlinelen is determined at header construction time.
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wrapping. This is in very rough support of RFC 2822's `higher level
syntactic breaks': split points preceded by a splitchar are preferred
during line splitting, with the characters preferred in the order in
which they appear in the string. Space and tab may be included in the
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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the value. The default value is the most useful for typical
Python applications, but it can be set to \r\n to produce RFC-compliant
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