On Mar 08, 2011, at 03:32 PM, Steffen Daode Nurpmeso wrote: >msg[f] is indeed and really an elegant and understand-at-a-glance >way to access headers. >(Possible restriction: it would be graceful if it would return and >take a list.)
Actually, I disagree. :) From experience, look at .get_payload(). It tries
to manage both scalar payloads and list payloads (for multiparts), and it
sucks. In hindsight (and email6) I hope that .get_payload() will be split
into separate API methods, one for simple payloads like image or audio data,
and another for multipart access.
So for headers, I think setitem/getitem/delitem should be reserved for simple
manipulation with well defined semantics (as it currently is <wink>), and new
API methods should be added for full access to headers when multiple ones are
present.
>... and give me a way to also delete just one body of a field and
>i'll be lucky.
That's a good idea too.
>Maybe simply 'Message._headers = {normalized_field = [bodies]}'?
I'm not sure what that means, but yeah, you definitely don't want to be
messing with that private attribute.
>But, why not .delete_all_of(0, 2, 5), realized by a walk in equal
>spirit to .get_all().
>
>(My thought was that a new Proxy class can be added very easily,
>requiring only one new method in Message and
>without affecting the remaining interface,
>whatever status David's local EMAIL 6 branch is currently in and
>whatever approach he will have chosen in the end.
It's an interesting idea. Why don't you flesh that out and propose something
concrete, with a working implementation if possible?
Anyway, rewriting headers is not that hard:
#! /usr/bin/env python3
from email import message_from_string as mfs
msg = mfs("""\
From: aper...@example.com
X-Header: aardvark
To: bper...@example.com
X-Header: beaver
Subject: foo
X-Header: cougar
X-Header: dingo
""")
def yummy_toppings():
for topping in ('duck', 'cheese', 'black olive', 'anchovy'):
yield topping
toppings = yummy_toppings()
new_headers = []
for header, value in msg.items():
if header.lower() == 'x-header':
new_headers.append(('X-Header', toppings.__next__()))
else:
new_headers.append((header, value))
for header in msg:
del msg[header]
for header, value in new_headers:
msg[header] = value
print(msg)
Cheers,
-Barry
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