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\declaremodule{standard}{email.Iterators}
\modulesynopsis{Iterate over a message object tree.}
Iterating over a message object tree is fairly easy with the
\method{Message.walk()} method. The \module{email.Iterators} module
provides some useful higher level iterations over message object
trees.
\begin{funcdesc}{body_line_iterator}{msg}
This iterates over all the payloads in all the subparts of \var{msg},
returning the string payloads line-by-line. It skips over all the
subpart headers, and it skips over any subpart with a payload that
isn't a Python string. This is somewhat equivalent to reading the
flat text representation of the message from a file using
\method{readline()}, skipping over all the intervening headers.
\end{funcdesc}
\begin{funcdesc}{typed_subpart_iterator}{msg\optional{,
maintype\optional{, subtype}}}
This iterates over all the subparts of \var{msg}, returning only those
subparts that match the MIME type specified by \var{maintype} and
\var{subtype}.
Note that \var{subtype} is optional; if omitted, then subpart MIME
type matching is done only with the main type. \var{maintype} is
optional too; it defaults to \mimetype{text}.
Thus, by default \function{typed_subpart_iterator()} returns each
subpart that has a MIME type of \mimetype{text/*}.
\end{funcdesc}
The following function has been added as a useful debugging tool. It
should \emph{not} be considered part of the supported public interface
for the package.
\begin{funcdesc}{_structure}{msg\optional{, fp\optional{, level}}}
Prints an indented representation of the content types of the
message object structure. For example:
\begin{verbatim}
>>> msg = email.message_from_file(somefile)
>>> _structure(msg)
multipart/mixed
text/plain
text/plain
multipart/digest
message/rfc822
text/plain
message/rfc822
text/plain
message/rfc822
text/plain
message/rfc822
text/plain
message/rfc822
text/plain
text/plain
\end{verbatim}
Optional \var{fp} is a file-like object to print the output to. It
must be suitable for Python's extended print statement. \var{level}
is used internally.
\end{funcdesc}
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