11.13 Standard Module rfc822
This module defines a class, Message, which represents a
collection of ``email headers'' as defined by the Internet standard
RFC 822. It is used in various contexts, usually to read such
headers from a file.
Note that there's a separate module to read Unix, MH, and MMDF
style mailbox files: mailbox .
- Message (file[, seekable])
A Message instance is instantiated with an open file object as
parameter. The optional seekable parameter indicates if the
file object is seekable; the default value is 1 for true.
Instantiation reads headers from the file up to a blank line and
stores them in the instance; after instantiation, the file is
positioned directly after the blank line that terminates the headers.
Input lines as read from the file may either be terminated by CR-LF or
by a single linefeed; a terminating CR-LF is replaced by a single
linefeed before the line is stored.
All header matching is done independent of upper or lower case;
e.g. m['From'], m['from'] and
m['FROM'] all yield the same result.
- parsedate (date)
Attempts to parse a date according to the rules in RFC 822.
however, some mailers don't follow that format as specified, so
parsedate() tries to guess correctly in such cases.
date is a string containing an RFC 822 date, such as
'Mon, 20 Nov 1995 19:12:08 -0500'. If it succeeds in parsing
the date, parsedate() returns a 9-tuple that can be passed
directly to time.mktime(); otherwise None will be
- parsedate_tz (date)
Performs the same function as parsedate(), but returns
either None or a 10-tuple; the first 9 elements make up a tuple
that can be passed directly to time.mktime(), and the tenth
is the offset of the date's timezone from UTC (which is the official
term for Greenwich Mean Time). (Note that the sign of the timezone
offset is the opposite of the sign of the time.timezone
variable for the same timezone; the latter variable follows the
POSIX standard while this module follows RFC 822.) If the input
string has no timezone, the last element of the tuple returned is
- mktime_tz (tuple)
Turn a 10-tuple as returned by parsedate_tz() into a UTC
timestamp. It the timezone item in the tuple is None, assume
local time. Minor deficiency: this first interprets the first 8
elements as a local time and then compensates for the timezone
difference; this may yield a slight error around daylight savings time
switch dates. Not enough to worry about for common use.