dolfin team mailing list archive

[Johan Hake <hake@xxxxxxxxx>]

On Sunday 06 September 2009 20:48:28 logg wrote:
> On Sun, Sep 06, 2009 at 04:56:59PM -0000, Johan Hake wrote:
> > On Sunday 06 September 2009 18:36:32 logg wrote:
> > > Public bug reported:
> > >
> > > PETSc command-line options like --petsc.foo 3 are not handled in
> > > Python:
> > >
> > >   StandardError: unknown option petsc.info
> > >
> > > Don't know why this doesn't work in Python since the Python interface
> > > seems to call the C++ implementation which handles PETSc command-line
> > > options.
> > >
> > > ** Affects: dolfin
> > >      Importance: Medium
> > >      Assignee: Johan Hake (johan-hake)
> > >          Status: New
> >
> > How should it look like when this works? Do we get any message from PETSc
> > that it has got a parameter?
> 
> Yes, at least when PETSc runs in verbose mode. That can be done by
> passing the -info command-line argument to PETSc. :-)
> 
> > Or is it the dolfin part of the parameter system that does not get to
> > parse the parameter correctly?
> 
> My fault. This is not a bug. I got confused as to what the demo is
> actually doing. I used another test program when I tested the
> command-line parsing for PETSc in C++. The "problem" is that the
>  command-line is parsed by application_parameters, not by
>  dolfin::parameters and options are only filtered out for PETSc for the
>  global parameter set, not for other parameters like
>  application_parameters.

Ok!

> The following works fine:
> 
>   python -c "from dolfin import *; parameters.parse()" --petsc.info
> 
> I'm closing the bug.
>
> By the way, very nifty with
> 
>   parameters.foo = 1.0
> 
> etc instead of parameters["foo"] = 1.0. :-)

Yes isn't it!

Unfortunately it is not visible through the tab-completion in ipython, as that 
commando use the __dict__ attribute for this, and not __get/setattr__ 
commands. In python < 3.0 there are a lot of different ways of setting 
attributes... each with different preference and behavior. 

Johan
 
> --
> Anders
>

-- 
Handle PETSc command-line options in Python
https://bugs.launchpad.net/bugs/425282
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Status in DOLFIN: Invalid

Bug description:
PETSc command-line options like --petsc.foo 3 are not handled in Python:

  StandardError: unknown option petsc.info

Don't know why this doesn't work in Python since the Python interface seems
to call the C++ implementation which handles PETSc command-line options.