On Thu, 27 Aug 2009 at 17:42, Mark Sapiro wrote:
Nicholas Cole wrote:
What do I need to do to ensure that emails are generated only in 7,
not 8-bit encodings? I assume that I need to use
email.charset.add_charset , but can't quite work out what incantation
to give it. Does anyone have any pointers?
I'm not sure what it is you're asking. Does this answer your question?
import email.message
m = email.message.Message()
m.set_payload("""A few lines
... of 7-bit text
...
... No high bit characters.
... """, 'us-ascii')
print m.as_string()
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
A few lines
of 7-bit text
No high bit characters.
It probably doesn't, since if that message contains high range
characters it will result in an encoding of 8bit:
import email.message
m = email.message.Message()
m.set_payload("""A few lines
... of 8-bit text
...
... One high bit character: ??.
... """, 'us-ascii')
print m.as_string()
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 8bit
A few lines
of 8-bit text
One high bit character: ??.
Since 8bit isn't technically us-ascii, I wonder if this is a bug.
With a little experiement and a look at the code, it appears that you
will get 7bit clean output as long as you always provide a charset
for the input other than us-ascii that the charset module has been
told should be encoded using QP or BASE64 (which is true for
all of the already registered charsets).
EG: this results in 7bit clean output:
i>>> import email.message
m = email.message.Message()
m.set_payload("""A few lines
... of 8-bit text
...
... One high bit character: ??.
... """, 'latin-1')
print m.as_string()
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
A few lines
of 8-bit text
One high bit character: =C2=B2.
I suspect this is not a complete answer to the question...
--David
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