12.11.1 Message Objects
A Message instance has the following methods:
Seek to the start of the message body. This only works if the file
object is seekable.
Returns a line's canonicalized fieldname (the dictionary key that will
be used to index it) if the line is a legal RFC 2822 header; otherwise
None (implying that parsing should stop here and the
line be pushed back on the input stream). It is sometimes useful to
override this method in a subclass.
Return true if the given line is a delimiter on which Message should
stop. The delimiter line is consumed, and the file object's read
location positioned immediately after it. By default this method just
checks that the line is blank, but you can override it in a subclass.
Return true if the given line should be ignored entirely, just skipped.
By default this is a stub that always returns false, but you can
override it in a subclass.
Return a list of lines consisting of all headers matching
name, if any. Each physical line, whether it is a continuation
line or not, is a separate list item. Return the empty list if no
header matches name.
Return a list of lines comprising the first header matching
name, and its continuation line(s), if any. Return
None if there is no header matching name.
Return a single string consisting of the text after the colon in the
first header matching name. This includes leading whitespace,
the trailing linefeed, and internal linefeeds and whitespace if there
any continuation line(s) were present. Return
None if there is
no header matching name.
- getheader(name[, default])
getrawheader(name), but strip leading and trailing
whitespace. Internal whitespace is not stripped. The optional
default argument can be used to specify a different default to
be returned when there is no header matching name.
- get(name[, default])
An alias for getheader(), to make the interface more compatible
with regular dictionaries.
Return a pair
(full name, email address) parsed
from the string returned by
getheader(name). If no
header matching name exists, return
otherwise both the full name and the address are (possibly empty)
Example: If m's first header contains the
'email@example.com (Jack Jansen)', then
m.getaddr('From') will yield the pair
('Jack Jansen', 'firstname.lastname@example.org').
If the header contained
'Jack Jansen <email@example.com>' instead, it would yield the
exact same result.
This is similar to
getaddr(list), but parses a header
containing a list of email addresses (e.g. a header) and
returns a list of
(full name, email address) pairs
(even if there was only one address in the header). If there is no
header matching name, return an empty list.
If multiple headers exist that match the named header (e.g. if there
are several headers), all are parsed for addresses.
Any continuation lines the named headers contain are also parsed.
Retrieve a header using getheader() and parse it into a 9-tuple
compatible with time.mktime(); note that fields 6, 7, and 8
are not usable. If there is no header matching
name, or it is unparsable, return
Date parsing appears to be a black art, and not all mailers adhere to
the standard. While it has been tested and found correct on a large
collection of email from many sources, it is still possible that this
function may occasionally yield an incorrect result.
Retrieve a header using getheader() and parse it into a
10-tuple; the first 9 elements will make a tuple compatible with
time.mktime(), and the 10th is a number giving the offset
of the date's timezone from UTC. Note that fields 6, 7, and 8
are not usable. Similarly to getdate(), if
there is no header matching name, or it is unparsable, return
Message instances also support a limited mapping interface.
m[name] is like
m.getheader(name) but raises KeyError if
there is no matching header; and
m.setdefault(name[, default]) act as
expected, with the one difference that setdefault() uses
an empty string as the default value. Message instances
also support the mapping writable interface
del m[name]. Message objects do not
support the clear(), copy(), popitem(), or
update() methods of the mapping interface. (Support for
get() and setdefault() was only added in Python
Finally, Message instances have some public instance variables:
A list containing the entire set of header lines, in the order in
which they were read (except that setitem calls may disturb this
order). Each line contains a trailing newline. The
blank line terminating the headers is not contained in the list.
The file or file-like object passed at instantiation time. This can
be used to read the message content.
The Unix "From " line, if the message had one, or an empty
string. This is needed to regenerate the message in some contexts,
such as an
mbox-style mailbox file.
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