Re: [Gramps-devel] More noob questions

[Doug B. <dou...@gm...>]

Some hints below.

On Mon, May 31, 2010 at 7:44 AM, doug <do...@o2...> wrote:
> I've been trying to run code in the Python gramplet (to make use of my
> gramps database and environment), but I seem to have just got into a
> complete twist.
>
> I want to, say, run code in a gramplet. In the Python gramplet I write
> the entire code interactively to define a class and method and then make
> assignments to carry out some action. Fine; it works.
>
> I write the class and method definitions as a gramplet, the gramplet
> appears in the gramplet list; I click on it; the window appears but no
> action takes place.

This is what would happen if you have an error in your code. There is
probably a message in the console.

> Close the gramplet.
> I call up the Python gramplet and try to import my gramplet preparatory
> to writing the assignments to cause an action to take place. But when I
> try to use the method(s) defined in the gramplet I get an error, e.g.
>
> <quote>
>  >import OpenFF
>  >x=OpenFF()
>
> Traceback (most recent call last):
>   File
> "/home/fred/.gramps/gramps33/plugins/PythonGramplet/PythonGramplet.py",
> line 98, in process_command
>     exec exp in self.env
>   File "<string>", line 1, in <module>
> TypeError: 'module' object is not callable
> <endquote>

I'm surprised that you can import your code at all. In trunk, addons
don't appear in the PYTHONPATH. You must be working on your code in a
directory that Gramps searches. You can add an addon path using
something like:

>>> import sys
>>> sys.path.append("/home/fred/.gramps/gramps33/plugins/MyAddon")

But to your error, which is stated at the bottom of the Python error:
'module' object is not callable. If you have a function or class in
the file OpenFF.py, then you need to do this:

>>> import OpenFF
>>> x = OpenFF.Open()

or this:

>>> from OpenFF import *
>>> x = Open()

This is just Python, so any book or webpage can help with these kinds
of issues. The Python Gramplet was written to act as a standard Python
interpreter (such as ipython, python -i, or idle).

> Or trying to import defs from, say, NarrativeWeb, and then continue with
> interactive code:
> <quote>
>  >import gen.db
>  >z=dbstate.db.get_object_from_gramps_id("O0343")
>  >import NarrativeWeb
>  >q=NarrativeWeb
>  >j=q.media_ref_rect_regions(z)
> Traceback (most recent call last):
>   File
> "/home/fred/.gramps/gramps33/plugins/PythonGramplet/PythonGramplet.py",
> line 98, in process_command
>     exec exp in self.env
>   File "<string>", line 1, in <module>
> AttributeError: 'module' object has no attribute 'media_ref_rect_regions'
> <endquote>

Again, you are getting confused between the module NarrativeWeb and
the classes in them. In addition, you can't just call a "method" from
a "class" without an "instance". If those words don't mean anything to
you then this will be hard.

But, I don't think I would debug a plugin this way. You can load a
module and code in it, but a plugin has many requirements to run. You
could use the Python debugger (pdb). This is what I do:

1) insert the line: "import pdb; pdb.set_trace()" into your Python code
2) run gramps (not in the background): "python src/gramps.py"
3) interactively step through the code.

> What am I doing so radically wrong? How does one run/debug code in the
> gramps environment?

We could also display the error message in the console. Rather than
"the gramplet did not load". That would go a long way toward giving
you what you need. I'll look at that...

-Doug

>
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