How to create a script that list itself ?

[Patrick Allaire]

How to create a script that list itself ?

I would like to know, where is the script's code is stored once we
start it. I know I can achieve that, using files :

print file('myscript. py','rb').read( )

But is there a way / a variable that contains the current file in
memory ?

Thanks.

Xaqc

[Grant Edwards]

Re: How to create a script that list itself ?

On 2006-01-09, Patrick Allaire <pallaire@gmail .com> wrote:
[color=blue]
> How to create a script that list itself ?[/color]

This is probably about as close as you're going to get:

import sys
pring open(sys.argv[0],'r').read()

And that isn't 100% reliable.
[color=blue]
> I would like to know, where is the script's code is stored once we
> start it.[/color]

It isn't. At least none of the implimentations I know of have
the script's source code in memory. The PVM or JVM bytecodes
to which the program has been compiled are in memory somewhere,
and there _may_ be some trick you can use to get at those.
[color=blue]
> I know I can achieve that, using files :
>
> print file('myscript. py','rb').read( )
>
> But is there a way / a variable that contains the current file in
> memory ?[/color]

I don't believe so.

--
Grant Edwards grante Yow! RHAPSODY in Glue!
at
visi.com

[Szabolcs Nagy]

Re: How to create a script that list itself ?

> But is there a way / a variable that contains the current file in[color=blue]
> memory ?[/color]
yes: import __main__

you can do:

import inspect
import __main__
print inspect.getsour ce(__main__)

or simply:

print open(__file__). read()


nsz

[Dave Hansen]

Re: How to create a script that list itself ?

On 9 Jan 2006 10:09:19 -0800 in comp.lang.pytho n, "Patrick Allaire"
<pallaire@gmail .com> wrote:
[color=blue]
>How to create a script that list itself ?[/color]

Stealing from the old C chestnut:

s="s=%c%s%c;pri nt s%%(34,s,34)";p rint s%(34,s,34)

[color=blue]
>
>I would like to know, where is the script's code is stored once we
>start it. I know I can achieve that, using files :[/color]

Well, in the above, the script (or rather, the information necessary
to print the script) is actually stored in a string that is part of
the script...

Regards,
-=Dave

--
Change is inevitable, progress is not.

[calfdog@yahoo.com]

Re: How to create a script that list itself ?

############### ############### ##########

import sys

path = os.path.dirname (sys.argv[0])
print "Path:%s" % (path)



############### ############### ########

If you ran this as a script,
This would print the location of where the script itself is running.



Hope it helps!

Rob

[Duncan Booth]

Re: How to create a script that list itself ?

Dave Hansen wrote:
[color=blue]
> Stealing from the old C chestnut:
>
> s="s=%c%s%c;pri nt s%%(34,s,34)";p rint s%(34,s,34)[/color]

Or a bit shorter:

s='s=%s;print s%%`s`';print s%`s`

[Tim Roberts]

Re: How to create a script that list itself ?

Duncan Booth <duncan.booth@i nvalid.invalid> wrote:[color=blue]
>
>Dave Hansen wrote:
>[color=green]
>> Stealing from the old C chestnut:
>>
>> s="s=%c%s%c;pri nt s%%(34,s,34)";p rint s%(34,s,34)[/color]
>
>Or a bit shorter:
>
>s='s=%s;prin t s%%`s`';print s%`s`[/color]

It was pointed out to me that the shortest Python program which produces
itself on stdout is:
--
- Tim Roberts, timr@probo.com
Providenza & Boekelheide, Inc.

[Mike Meyer]

Re: How to create a script that list itself ?

Tim Roberts <timr@probo.com > writes:[color=blue]
> It was pointed out to me that the shortest Python program which produces
> itself on stdout is:
> --[/color]

Which, oddly enough, is also the shortest shell program that produces
itself on stdout.

<mike
--
Mike Meyer <mwm@mired.or g> http://www.mired.org/home/mwm/
Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information.