Extending Python questions

Hi,
I am relative new to Python. Please tell me if the following is
possible.
I have a command line shell written in C. This shell executes some
commands which I would like to import to the python shell.
Here is an example command from my shell:

openconnection www.yahoo.com 12 2000

So I've created a dll (myshell_d.dll) according to the manual
("Extending Python with C or C++") and it works. The problem is the
syntax I have to use now is

myshell.openconnection('www.yahoo.com',12,2000)

It's not only the problem of comfort - it's a problem of changing
*some* scripts. And there's more than that - my shell functions
already know how to handle it's arguments (which's number may vary),
it doesn't need python to do that. All it needs is a pointer to a
string representing the arguments (in our case "www.yahoo.com 12
2000"). I've tried using PyArg_UnpackTuple but without success.

So I have two questions:
1. Is it possible to move the calls to a upper level (i.e. call
"openconnection" and not "myshell.openconnection") ?
2. Is is possible to remove the brackets and commas? (i.e.
"www.yahoo.com 12 2000" instead of ('www.yahoo.com',12,2000)?

My final goal is to use the original commands if possible.
thanks in advance,
Eli

re: Extending Python questions

> myshell.openconnection('www.yahoo.com',12,2000)[color=blue]
>
> It's not only the problem of comfort - it's a problem of changing
> *some* scripts. And there's more than that - my shell functions
> already know how to handle it's arguments (which's number may vary),
> it doesn't need python to do that. All it needs is a pointer to a
> string representing the arguments (in our case "www.yahoo.com 12
> 2000"). I've tried using PyArg_UnpackTuple but without success.[/color]

Then don't specify the arguments separately, but instead make it one string
argument, and pass it to your command:

myshell.openconnection('www.yahoo.com 12 2000')

[color=blue]
> So I have two questions:
> 1. Is it possible to move the calls to a upper level (i.e. call
> "openconnection" and not "myshell.openconnection") ?[/color]

from myshell import *
[color=blue]
> 2. Is is possible to remove the brackets and commas? (i.e.
> "www.yahoo.com 12 2000" instead of ('www.yahoo.com',12,2000)?[/color]

No. Thats too much of tinkering with pythons parser - you'd render all other
python sources useless, which I suspect outnumber your scripts by a degree
or two... :)
[color=blue]
> final goal is to use the original commands if possible.
> thanks in advance,[/color]

What do you use python for in the first place, if you want to keep
everything as it is?

What you can do is to read your scripts _using_ python instead of _passing_
them to python - then you can control the syntax of your scripting
language. The main loop could look like this:

import myshell
for line in sys.stdin.readlines():
command, rest = line.split()[0], " ".join(line.split()[1:])
getattr(myshell, command)(rest)


--
Regards,

Diez B. Roggisch

re: Extending Python questions

"Diez B. Roggisch" <deetsNOSPAM@web.de> wrote in message news:<cmb5i9$qbh$04$1@news.t-online.com>...[color=blue][color=green]
> > myshell.openconnection('www.yahoo.com',12,2000)
> >
> > It's not only the problem of comfort - it's a problem of changing
> > *some* scripts. And there's more than that - my shell functions
> > already know how to handle it's arguments (which's number may vary),
> > it doesn't need python to do that. All it needs is a pointer to a
> > string representing the arguments (in our case "www.yahoo.com 12
> > 2000"). I've tried using PyArg_UnpackTuple but without success.[/color]
>
> Then don't specify the arguments separately, but instead make it one string
> argument, and pass it to your command:
>
> myshell.openconnection('www.yahoo.com 12 2000')
>
>[color=green]
> > So I have two questions:
> > 1. Is it possible to move the calls to a upper level (i.e. call
> > "openconnection" and not "myshell.openconnection") ?[/color]
>
> from myshell import *
>[color=green]
> > 2. Is is possible to remove the brackets and commas? (i.e.
> > "www.yahoo.com 12 2000" instead of ('www.yahoo.com',12,2000)?[/color]
>
> No. Thats too much of tinkering with pythons parser - you'd render all other
> python sources useless, which I suspect outnumber your scripts by a degree
> or two... :)
>[color=green]
> > final goal is to use the original commands if possible.
> > thanks in advance,[/color]
>
> What do you use python for in the first place, if you want to keep
> everything as it is?
>
> What you can do is to read your scripts _using_ python instead of _passing_
> them to python - then you can control the syntax of your scripting
> language. The main loop could look like this:
>
> import myshell
> for line in sys.stdin.readlines():
> command, rest = line.split()[0], " ".join(line.split()[1:])
> getattr(myshell, command)(rest)[/color]


Thanks for the reply. I'll try those.
The reason I'm trying it this way is that a user can add python code
inside the scripts.

Eli

re: Extending Python questions

>[color=blue]
> Thanks for the reply. I'll try those.
> The reason I'm trying it this way is that a user can add python code
> inside the scripts.[/color]

Sorry to say that, but then you'll have to either write a real parser that
understands both syntaxes - and I bet thats more effort as converting your
existing scripts.

You can't have your cake and eat it - if you want python, you should use its
syntax.
--
Regards,

Diez B. Roggisch