Re: [Jython-users] new jython user stumped

[Robert W. B. <rb...@di...>]

Hello Jarrett,

"10 100" doesn't autoconvert to an array. More below...

On Fri, 22 Jun 2001, W. Jarrett Campbell wrote:
> Hello.  I've been using Python for a short while and one of my developers is
> insisting he'd prefer to supply me with Java classes rather than C++ classes
> so I'm contemplating making the jump to Jython.
>
> We were running a simple benchmark test to see if we could this system
> working for us and I've encountered a few problems.  Could someone here give
> me a few pointers?
>
> I'm trying to execute the following method in Jython:
>
>  public static void main(String[] args) {
>
>   try {
>        int count = Integer.parseInt(args[0]);
>        int arraySize = Integer.parseInt(args[1]);
>
>        ArrayBenchmark test = new ArrayBenchmark();
>        test.setLength( arraySize );
>
>        long totalTime = test.repeat(count);
>        System.out.println("Array Benchmark: " + count + " iteration(s) in "
> + totalTime + " milliseconds");
>   } catch (Exception e) {
>        System.out.println("Exception: " + e);
>        e.printStackTrace();
>   }
> }
>
> Every time I execute this command, I get a message that the String coercion
> is failing.  Any ideas?
>
> >>> com.ydyn.dynamo.test.ArrayBenchmark.main('10 100')
> Traceback (innermost last):
>   File "<console>", line 1, in ?
> TypeError: main(): 1st arg can't be coerced to String[]
> >>>

"10 100" becomes a String, not a String[]. Jython's nifty little tricks
allow you to use a Python List (PyList class) type full 'o strings to auto
convert to a String[].

i.e.:
>>> com.ydyn.dynamo.test.ArrayBenchmark.main(['10000000', '100'])
Array benchmark: 10000000 iterations in ...


-robert