On Jul 18, 2021, at 11:39 PM, Melanie Molifie <mmolifie@gmail.com> wrote:

Hi guys
I'm new to twisted and would appreciate some beginner guidance.

Hi Melanie! Welcome to the community. I hope we can get you set up better.

I'm trying to use the "python -m twisted.conch.stdio" command in command prompt but it does not work and gives the following error:
C:\WINDOWS\system32>python -m twisted.conch C:\Users\Melanie\AppData\Local\Microsoft\WindowsApps\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\python.exe: No module named twisted.conch.main; 'twisted.conch' is a package and cannot be directly executed

In this example you're doing `python -m twisted.conch`, not `python -m twisted.conch.stdio`, which will not work anywhere.
Unfortunately, the Conch standard-IO library (and therefore the conch terminal client, and twisted.conch.stdio) doesn't work on Windows and never has: https://twistedmatrix.com/trac/ticket/2157. However, you may be able to get it up and running with the Windows Subsystem for Linux, which I believe will present a Linux-like interface since as far as the application knows it's running on Linux: https://docs.microsoft.com/en-us/windows/wsl/about

I'm hoping that this will solve the rest of the error messages I'm having. I want to eventually be ably to run :

>>> from twisted.names import client
>>> client.getHostByName('www.example.com')
<Deferred at 0xf5c5a8 waiting on Deferred at 0xf5cb90>
>>> _
<Deferred at 0xf5c5a8 current result: '2606:2800:220:6d:26bf:1447:1097:aa7'>

>>> client.lookupMailExchange('twistedmatrix.com')
<Deferred at 0xf5cd40 waiting on Deferred at 0xf5cea8>
>>> _
<Deferred at 0xf5cd40 current result: ([<RR name=twistedmatrix.com type=MX class=IN ttl=1s auth=False>], [], [])>

Is the goal here specifically to do this with Conch, or would doing it with Jupyter Notebook (using something like https://twitter.com/glyph/status/1417360623818575876 which I found while researching a response to this email!) be sufficient?

Or, for that matter, could you just write a little program? A sample Python script that runs the reactor is probably easier to set up than a reactor-enabled REPL, particularly on Windows. (There are various options for a reactor-enabled REPL, it's definitely doable, but it might be a bit rough as a first step; as you're discovering.)

The aim is to get the deferred responses as shown in previous code, but all I get is:

>>> from twisted.names import client
>>> client.getHostByName('www.example.com')
<Deferred at 0x263d27b9dc8 waiting on Deferred at 0x263d27b9f48>
>>> _
<Deferred at 0x263d27b9dc8 waiting on Deferred at 0x263d27b9f48>
>>> client.lookupMailExchange('twistedmatrix.com')
<Deferred at 0x263d27c6a88 waiting on Deferred at 0x263d27c6c08>
>>> _
<Deferred at 0x263d27c6a88 waiting on Deferred at 0x263d27c6c08>

The reason you're getting this with a normal Python interactive interpreter is that the event loop which actually performs the I/O (does the DNS queries, in this case) isn't running at all, so the Deferreds are created, but never resolved.

Please help. I'm trying to send this to the twisted mailing group. If I'm wrong please nudge me in the right direction.

This is as good a place as any :).

Thanks in advance.
M

On Mon, Jul 19, 2021 at 12:43 AM Richard van der Hoff <richard@matrix.org> wrote:
On 16/07/2021 20:27, Glyph wrote:
>
>> One particular problem I came across was the type annotation on
>> inlineCallbacks. I've filed
>> https://twistedmatrix.com/trac/ticket/10231 about it - would
>> appreciate thoughts.
>>
> This definitely looks wrong; there should be a TypeVar in there. Adi,
> I'd go so far as to say that this should be a release blocker,
> although the change should be fairly minimal.
>
> Richard, could you please make a proper PR for this to get CI kicked
> off and make sure the new annotation doesn't cause any failures?
Done, in the form of https://github.com/twisted/twisted/pull/1632.

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