Re: internal error

Calmar wrote:

> > > It seems aap lets python evaluate a variable that does not
> > > exist:   _no.test_title
> >=20
> > Well, this happens in the eval() call, which is a Python function.  T=
hus
> > you get a Python error message.
> >=20
> > We could make an exception for errors in Scope.py, since this is
> > probably a variable that doesn't exist.  Try this patch:
>=20
> Yeah, that patch catches it.
>=20
> There seems to be a bad(probably good anyway?) thing about it:
>=20
>         tmpstring =3D _no.$(match)_title
>         @try:
>         @   title =3D eval(_no.tmpstring)
>         @except:
>         @   title =3D ""
>         :print $title
>=20
> that does not work anymore, because the error gets catched.

When I try this the "except:" part is done, which is what was intended,
right?

Note that it's not good to use try/except this way, because any typing
mistakes go unnoticed.

> I think there is another way, to check if a variable exists:
>=20
>        @if not hasattr(globals(), 'tmpstring'):
>        @   print "variable is not defined"
>=20
> That would work with checking for globals, but I think I would
> need to check for the _no namespace? On #python they told me
> something about dir(obj) but I can't get it to work.
>=20
> How could I check if a variable is 'defined' without the @try:
> @except: since that don't seems to work anymore with your patch?

You can use has_key():

	@if _no.has_key("varname"):

The scopes behave like dictionaries.  This does require you to split the
scope from the variable name.

--=20
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