Hi Thomas
First off, I was wrong about the type of header values as returned by
any of the accessors. They're just str (or list of str in the case of
`.get_all`). I guess Header is a write-only feature (necessary if you
want to use non-ASCII in the address headers), because it isn't useful
for parsing most headers.
You *can* get a non-str, namely `None`. But you say you tried
`msg.get('subject', '')`, which should return `''` in case of an
absent subject. So unless you've figured that out in the meantime,
you still have to deal with it. I would suggest printing or logging
`type(msg)` and `type(msg['subject']`.
Thomas Ward via Mailman-Developers writes:
> In later Python, there is a class of message called
> `email.message.EmailMessage` which has a few extra things than just
> `email.message.Message` (I think this is yielded by `email.parser`
> objects). By knowing that the class is essentially a subclass with
> some fixes of `email.message.Message` then the `iter_attachments()`
> approach I was using to iterate over attachments in the email
> message won't work because that is only part of
> `email.message.EmailMessage`.
If it isn't an `EmailMessage` (it probably isn't, everything in the
email package defaults to `Message` although there may be a better
policy than `Compat32`) you can probably do
```
def enhanceMessage(msg):
# check type here to avoid mayhem
msg.is_attachment = email.message.MIMEPart.is_attachment
msg._body_types = email.message.MIMEPart._body_types
msg.is_attachments = email.message.MIMEPart.is_attachments
```
(I didn't check the code terribly carefully, so if you get
AttributeErrors, just keep adding them according to the pattern
above.)
Or you could use something like
`msg = message_from_bytes(msg.as_bytes(), _class=EmailMessage)`,
although that's expensive.
> archiver function by Mailman helps. Because now I have to do the
> Old School(TM) way of iterating over `msg.walk()` and then
> determining if the message part has a content disposition and then
> confirm if it's an attachment or not and then have fun with it.
If for efficiency reasons you want to do it directly, the code in
/path/to/pypkgs/email/message.py, class MIMEPart is only about 30
lines including a couple of auxiliary methods and data. It should be
easy to adapt.
--
GNU Mailman consultant (installation, migration, customization)
Sirius Open Source https://www.siriusopensource.com/
Software systems consulting in Europe, North America, and Japan
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