[Yum] more about: passing two or more variables from a python routine.

[Rick Graves]

Robert,

The subroutine can pass back expressions -- they do
not have to be reduced to variables.

So the last line of the subroutine could be:

   return expr1, expr2, ...

Rick


--- Rick Graves <gravesricharde at yahoo.com> wrote:

> Date: Tue, 28 Sep 2004 12:02:52 -0700 (PDT)
> From: Rick Graves <gravesricharde at yahoo.com>
> Subject: Re: passing two or more variables from a
> python routine. 
> To: yum at lists.dulug.duke.edu
> 
> Robert,
> 
> You wrote:
> 
> > ... but I don't know how
> > to return two variables from one subroutine
> fragment
> in python.
> > Probably very simply.
> 
> 
> In case no one has addressed this yet, you are
> right.
> (I am just a python newbie, but I know the answer to
> that one.)   
> 
> In the subroutine, the last line should be like
> this:
> 
>    return Svar1, Svar2
> 
> And the call in the calling routine should be:
> 
>    Cvar1, Cvar2 = subroutine( args )
> 
> BTW, the variables can have exactly the same names
> in
> the calling routine and subroutine, but this is not
> a
> requirement.  So this would be OK in the subroutine:
> 
>    return var1, var2
> 
> And this would be OK in the calling routine:
> 
>    var1, var2 = subroutine( args )
> 
> I do not know the limit to the number of variables
> you
> can pass, but it is surely big.  The value coming
> out
> of the subroutine is really a tuple, which is
> automatically unpacked in the calling routine.  And
> the values coming out can be of different types. 
> The
> number of targets and the number coming out must
> match, however.  
> 
> I do not know how it could be any more simple than
> that!
> 
> Rick Graves
> (python newbie)
> 
> 
> --- yum-request at lists.dulug.duke.edu wrote:
> 
> 
> > Message: 5
> > Date: Tue, 28 Sep 2004 12:21:56 -0400 (EDT)
> > From: "Robert G. Brown" <rgb at phy.duke.edu>
> > Subject: [Yum] distribution variable works...
> > To: "Yellowdog Updater, Modified"
> <yum at lists.dulug.duke.edu>
> > Message-ID:
> > 
>
<Pine.LNX.4.44.0409281138170.20382-100000 at lucifer.rgb.private.net>
> > Content-Type: TEXT/PLAIN; charset=US-ASCII
> > 
> > On Tue, 28 Sep 2004, Robert G. Brown wrote:
> > 
> > The following (2.0.7 derived) config.py actually
> works and does the
> > substitutions and everything.  It isn't efficient
> -
> both variables 
> > could
> > be set with one set of rpm.TransactionSet() calls,
> but I don't know how
> > to return two variables from one subroutine
> fragment
> in python.
> > Probably very simply.
> > 
> > 
> 
>