mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-09-26 10:19:53 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 8

#2814: remove deprecated classes from mailbox module. Patch by Humberto Diogenes.

Browse source
This commit is contained in:
Georg Brandl 2008-05-11 08:59:40 +00:00
parent f7fa63dd55
commit edb978ff63
3 changed files with 1 additions and 319 deletions
Download patch file Download diff file Expand all files Collapse all files

127
Doc/library/mailbox.rst
View file

@ -1501,133 +1501,6 @@ The following exception classes are defined in the :mod:`mailbox` module:
instance attempts to read a corrupted :file:`.mh_sequences` file.
.. _mailbox-deprecated:
Deprecated classes and methods
------------------------------
Older versions of the :mod:`mailbox` module do not support modification of
mailboxes, such as adding or removing message, and do not provide classes to
represent format-specific message properties. For backward compatibility, the
older mailbox classes are still available, but the newer classes should be used
in preference to them.
Older mailbox objects support only iteration and provide a single public method:
.. method:: oldmailbox.next()
Return the next message in the mailbox, created with the optional *factory*
argument passed into the mailbox object's constructor. By default this is an
:class:`rfc822.Message` object (see the :mod:`rfc822` module). Depending on the
mailbox implementation the *fp* attribute of this object may be a true file
object or a class instance simulating a file object, taking care of things like
message boundaries if multiple mail messages are contained in a single file,
etc. If no more messages are available, this method returns ``None``.
Most of the older mailbox classes have names that differ from the current
mailbox class names, except for :class:`Maildir`. For this reason, the new
:class:`Maildir` class defines a :meth:`next` method and its constructor differs
slightly from those of the other new mailbox classes.
The older mailbox classes whose names are not the same as their newer
counterparts are as follows:
.. class:: UnixMailbox(fp[, factory])
Access to a classic Unix-style mailbox, where all messages are contained in a
single file and separated by ``From`` (a.k.a. ``From_``) lines. The file object
*fp* points to the mailbox file. The optional *factory* parameter is a callable
that should create new message objects. *factory* is called with one argument,
*fp* by the :meth:`next` method of the mailbox object. The default is the
:class:`rfc822.Message` class (see the :mod:`rfc822` module -- and the note
below).
.. note::
For reasons of this module's internal implementation, you will probably want to
open the *fp* object in binary mode. This is especially important on Windows.
For maximum portability, messages in a Unix-style mailbox are separated by any
line that begins exactly with the string ``'From '`` (note the trailing space)
if preceded by exactly two newlines. Because of the wide-range of variations in
practice, nothing else on the ``From_`` line should be considered. However, the
current implementation doesn't check for the leading two newlines. This is
usually fine for most applications.
The :class:`UnixMailbox` class implements a more strict version of ``From_``
line checking, using a regular expression that usually correctly matched
``From_`` delimiters. It considers delimiter line to be separated by ``From
name time`` lines. For maximum portability, use the
:class:`PortableUnixMailbox` class instead. This class is identical to
:class:`UnixMailbox` except that individual messages are separated by only
``From`` lines.
.. class:: PortableUnixMailbox(fp[, factory])
A less-strict version of :class:`UnixMailbox`, which considers only the ``From``
at the beginning of the line separating messages. The "*name* *time*" portion
of the From line is ignored, to protect against some variations that are
observed in practice. This works since lines in the message which begin with
``'From '`` are quoted by mail handling software at delivery-time.
.. class:: MmdfMailbox(fp[, factory])
Access an MMDF-style mailbox, where all messages are contained in a single file
and separated by lines consisting of 4 control-A characters. The file object
*fp* points to the mailbox file. Optional *factory* is as with the
:class:`UnixMailbox` class.
.. class:: MHMailbox(dirname[, factory])
Access an MH mailbox, a directory with each message in a separate file with a
numeric name. The name of the mailbox directory is passed in *dirname*.
*factory* is as with the :class:`UnixMailbox` class.
.. class:: BabylMailbox(fp[, factory])
Access a Babyl mailbox, which is similar to an MMDF mailbox. In Babyl format,
each message has two sets of headers, the *original* headers and the *visible*
headers. The original headers appear before a line containing only ``'*** EOOH
***'`` (End-Of-Original-Headers) and the visible headers appear after the
``EOOH`` line. Babyl-compliant mail readers will show you only the visible
headers, and :class:`BabylMailbox` objects will return messages containing only
the visible headers. You'll have to do your own parsing of the mailbox file to
get at the original headers. Mail messages start with the EOOH line and end
with a line containing only ``'\037\014'``. *factory* is as with the
:class:`UnixMailbox` class.
If you wish to use the older mailbox classes with the :mod:`email` module rather
than the deprecated :mod:`rfc822` module, you can do so as follows::
import email
import email.Errors
import mailbox
def msgfactory(fp):
try:
return email.message_from_file(fp)
except email.Errors.MessageParseError:
# Don't return None since that will
# stop the mailbox iterator
return ''
mbox = mailbox.UnixMailbox(fp, msgfactory)
Alternatively, if you know your mailbox contains only well-formed MIME messages,
you can simplify this to::
import email
import mailbox
mbox = mailbox.UnixMailbox(fp, email.message_from_file)
.. _mailbox-examples:
Examples