Re: Evals from Java

In Jython 2.2 the return value is a PyObject because it can either be
a PyInteger or a PyLong (This is a post 2.1 feature in CPython -- ints
auto-convert to longs on overflow)  If you are sure that you will stay
in the integer range you can cast to a PyInteger and call getValue(). 
If you might overflow, you'll want to check to see if you have a
PyLong and then cast to PyLong (then you can call getValue() from
PyLong, which will yield a BigInteger.

-Frank

On 3/25/06, Jake Eakle <jseakle@xxxxxxxxx> wrote:
> Thanks everyone for your help! I finally got it up and running, and it
> worked splendidly. You may be interested in knowing, Kent, that the returned
> PyObject is not in fact a PyInt - I worked around this by calling toString
> on it and then using Integer.parseInt. I'm sure there's a better way, but it
> worked fine. Again, thanks much!
>
> Jake
>
>
> On 3/25/06, Jeff Emanuel < jemanuel@xxxxxxxx> wrote:
> > jython.jar must be in your compile classpath.
> >
> > Jake Eakle wrote:
> > > Thanks! The code is all set up now, but I am still having a bit of a
> problem
> > > - it can't find org.python.core or
> org.python.util.PythonInterpreter. I'm
> > > compiling using javac in a Mac OS X terminal, and both the java files
> and
> > > the jythonRelease_2_2alpha1 folder are both in the home directory. I
> tried
> > > compiling the example you pointed me to, from its default position in
> the
> > > Jython file heirarchy, and it gave the same errors. I installed Jython
> > > fully, etc. and I'm not sure how to proceed. Help would be much
> appreciated.
> > >
> > >
> > >
> > > On 3/24/06, Kent Johnson <kent37@xxxxxxx> wrote:
> > >
> > >>Jake Eakle wrote:
> > >>
> > >>>Hi all,
> > >>>I know nothing whatsoever about Python. I just downloaded Jython oin
> the
> > >>>recommendation of someone in some forum responding to a question about
> > >>>how to evaluate strings from Java - it turns out that the standaard
> > >>>libraries provide no real way to do this.
> > >>>
> > >>>I have a very simple situation - I have a string with a basic
> > >>>mathmatical expression, like  "3+45*2" and I want to store it's value
> in
> > >>>an int from a Java program.
> > >>
> > >>This example shows how to do what you want:
> > >>http://www.jython.org/docs/embedding.html
> > >>
> > >>I'm not sure but I think the returned PyObject will actually be a
> > >>PyInteger and you can call getValue() on it to get the result.
> > >>
> > >>You should know that eval() is a security hole that leaves you open to
> > >>denial-of-service attacks and probably data loss. Don't eval() strings
> > >>from an untrusted source.
> > >>
> > >>Kent
> > >>
> > >>
> > >>
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> > >
> >
>
>


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