[SciPy-user] accessing a class's code

Ryan Krauss ryanlists at gmail.com
Wed Apr 19 13:04:42 CDT 2006

Thanks Doug.  I think that is a great start.

Not to justify myself, but I have gotten like 10 responses on
comp.lang.python mainly asking why I would want to do such a thing or
assuming I am an idiot.

I got one response here and it was very helpful.


On 4/19/06, LATORNELL, Doug <Doug.LATORNELL at mdsinc.com> wrote:
> I think the inspect module
> (http://docs.python.org/lib/module-inspect.html) in the standard library
> might enable you to do what you want.  I've never used inspect (just
> read its docs when they caught my eye a couple of weeks ago), nor done
> what you describe though, so I can't promise that I'm not sending you on
> a wild goose chase :-)
> Doug
> > -----Original Message-----
> > From: scipy-user-bounces at scipy.net
> > [mailto:scipy-user-bounces at scipy.net] On Behalf Of Ryan Krauss
> > Sent: April 19, 2006 08:40
> > To: SciPy Users List
> > Subject: [SciPy-user] accessing a class's code
> >
> > I don't have the best of luck with comp.lang.python and I get
> > great results from this list.  So, I am mildly sorry about
> > the general python question and the double post.
> >
> > I have a set of Python classes that represent elements in a
> > structural model for vibration modeling (sort of like FEA).
> > Some of the parameters of the model are initially unknown and
> > I do some system identification to determine the parameters.
> > After I determine these unknown parameters, I would like to
> > substitute them back into the model and save the model as a
> > new python class.  To do this, I think each element needs to
> > be able to read in the code for its __init__ method, make the
> > substitutions and then write the new __init__ method to a
> > file defining a new class with the now known parameters.
> >
> > Is there a way for a Python instance to access its own code
> > (especially the __init__ method)?  And if there is, is there a clean
> > way to write the modified code back to a file?   I assume that if I
> > can get the code as a list of strings, I can output it to a
> > file easily enough.
> >
> > I am tempted to just read in the code and write a little
> > Python script to parse it to get me the __init__ methods, but
> > that seems like reinventing the wheel.
> >
> > I don't just want to read and write a vector of coefficients
> > because after I have identified the unknown structural
> > parameters, I will use the model for control design and there
> > will be a new set of unknown control parameters.
> >
> > Thanks,
> >
> > Ryan
> >
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