SageNB broken because of stmp???

[Jori Mäntysalo (TAU)]

I did a fresh install, i.e. start from git clone
git://github.com/sagemath/sage.git and so on. Sage starts and I can start
jupyter also. However ./sage --notebook=sagenb says

DeprecationWarning: the imp module is deprecated in favour of importlib;
see the module's documentation for alternative uses
import imp
Traceback (most recent call last):
. . .
from twisted.mail import smtp, relaymanager # problematic with python 3
ImportError: cannot import name 'smtp' from 'twisted.mail' (unknown
location)

So have we broken sagenb totally when moving to Python 3?

--
Jori Mäntysalo

Tampereen yliopisto - Ihminen ratkaisee

[Dima Pasechnik]

Sagenb is not going to work under python3

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[Frédéric Chapoton]

Yes. No sagenb in Python3.

The current stumbling point is that sagenb uses twisted and twisted is not py3 compatible, despite pretending to be so.

I did make some lonely efforts to make sagenb work with py3. This stopped on the error message that you give.

Frederic

[Dima Pasechnik]

On Sat, Nov 23, 2019 at 5:10 PM Frédéric Chapoton <fchap...@gmail.com> wrote:
>
> Yes. No sagenb in Python3.
>
> The current stumbling point is that sagenb uses twisted and twisted is not py3 compatible, despite pretending to be so.

We are on twisted version 16, which is more than 3 years old. The
current one is 19, and there were major API changes since then, so the
porting needs a serious effort.
https://github.com/twisted/twisted/releases

>
> I did make some lonely efforts to make sagenb work with py3. This stopped on the error message that you give.
>
> Frederic
>
> Le samedi 23 novembre 2019 15:13:50 UTC+1, Jori Mäntysalo (TAU) a écrit :
>>
>> I did a fresh install, i.e. start from git clone
>> git://github.com/sagemath/sage.git and so on. Sage starts and I can start
>> jupyter also. However ./sage --notebook=sagenb says
>>
>> DeprecationWarning: the imp module is deprecated in favour of importlib;
>> see the module's documentation for alternative uses
>> import imp
>> Traceback (most recent call last):
>> . . .
>> from twisted.mail import smtp, relaymanager # problematic with python 3
>> ImportError: cannot import name 'smtp' from 'twisted.mail' (unknown
>> location)
>>
>> So have we broken sagenb totally when moving to Python 3?
>>
>> --
>> Jori Mäntysalo
>>
>> Tampereen yliopisto - Ihminen ratkaisee
>

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[Jori Mäntysalo (TAU)]

On Sat, 23 Nov 2019, Frédéric Chapoton wrote:

> The current stumbling point is that sagenb uses twisted and twisted is not
> py3 compatible, despite pretending to be so.

OK. I opened #28792 for better error message. Also I suppose we must
change documentation.