How to get key values when iterating a mailbox?
clp2 at rebertia.com
Mon Oct 18 18:57:19 CEST 2010
On Mon, Oct 18, 2010 at 8:42 AM, <tinnews at isbd.co.uk> wrote:
> I'm trying to delete some messages from a mailbox when they are older
> than a certain number of days.
> If I iterate through the mailbox and find a message that needs
> deleting how do I get its key so I can do "remove(key)"?
> The trouble is that, as the documentation says: "The default Mailbox
> iterator iterates over message representations, not keys as the
> default dictionary iterator does." So if you try something like:-
> for f in os.listdir(junkdir):
> mbxPath = os.path.join(junkdir, f)
> mbx = mailbox.mbox(mbxPath, factory=None)
> for k, msg in mbx:
> if <something is true>
> Then you get an exception on "for k, msg in mbx" which is an attribute
> error, presumably because a mailbox isn't a 'real' iterator.
No, it's probably because iterating over a Mailbox yields Message-s
rather than (key, Message) pairs; Python thus tries to unpack each
Message into a (k, msg) pair (since that's how you wrote your
for-loop), but this fails since (I would assume) Messages aren't
> So how,
> do I get that key value?
If you want to iterate over key-value pairs (aka "items"), then ask
Mailbox for items in the first place:
for k, msg in mbx.iteritems():
# rest of code
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