Re: [Jython-dev] Jython3 development

[Isaiah P. <is...@gm...>]

Hi Frank,

I've just signed the contributor agreement (my username on bugs.python.org
is isaiah), thanks for pointing it out.

Because of the current immature status of the branch, I am trying to get as
much working as possible, so I didn't run the tests nor add new tests for
my work, hope that makes sense for the moment.

I also encountered a problem when trying to add the `int.from_bytes` class
method,

>>> int.from_bytes(b'\xfc\x00', byteorder='big', signed=True)
 -1024

I tried to add

```java
@ExposedClassMethod(doc = BuiltinDocs.int_from_bytes_doc)
final static PyObject long_from_bytes(PyType type, PyObject[] args,
String[] keywords) {
...
}
```

But get the following exception when compiling:

*/home/isaiah/codes/java/jython3/build.xml:799:
java.lang.NoSuchMethodError: org.python.core.PyBuiltinClassMethodNarrow:
method <init>(Ljava/lang/String;)V not found at
org.python.core.PyLong$long_from_bytes_exposer.<init>(Unknown Source) at
org.python.core.PyLong$PyExposer.<init>(Unknown Source) at
org.python.core.PyLong.<clinit>(PyLong.java) at
org.python.core.Py.newLong(Py.java:617) at
org.python.core.FloatInfo.getInfo(PySystemState.java:1943) at
org.python.core.PySystemState.<clinit>(PySystemState.java:195) at
org.python.util.JycompileAntTask.process(JycompileAntTask.java:30) at
org.python.util.GlobMatchingTask.execute(GlobMatchingTask.java:70) at
org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293) at
sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source) at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498) at
org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348) at
org.apache.tools.ant.Target.execute(Target.java:435) at
org.apache.tools.ant.Target.performTasks(Target.java:456) at
org.apache.tools.ant.Project.executeSortedTargets(Project.java:1405) at
org.apache.tools.ant.Project.executeTarget(Project.java:1376) at
org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1260) at
org.apache.tools.ant.Main.runBuild(Main.java:853) at
org.apache.tools.ant.Main.startAnt(Main.java:235) at
org.apache.tools.ant.launch.Launcher.run(Launcher.java:285) at
org.apache.tools.ant.launch.Launcher.main(Launcher.java:112) *


It works with the following method, but it won't support keyword
parameters, and the `signed` argument cannot be optional:

```java
final static PyObject long_from_bytes(PyType type, PyObject bytes, PyObject
byteorder, PyObject signed) {
```

 How to express such method signature in native implemented method?

Regards,
Isaiah

On Sun, 24 Apr 2016 at 19:42 fwi...@gm... <fwi...@gm...>
wrote:

> On Thu, Apr 21, 2016 at 5:56 AM, Isaiah Peng <is...@gm...> wrote:
> > Hi guys,
> >
> > I am working on python 3 support for jython, in the jython/jython3
> > repository, I've created a few pull request on github,
> >
> > https://github.com/jython/jython3/pulls
> >
> > Please don't hesitate to give your valuable feedbacks.
> Hi Isaiah,
>
> I am planning to start really examining these today, thanks for the
> pull requests! I'm especially excited to see that you have not only
> managed to somehow work with the very immature jython3 work, but also
> updated Jython's grammar: few dare to venture there :).
>
> Have you signed a Python contributor agreement? For a set of
> contributions of this size we'll need that (or at least assurance that
> you plan to do that as soon as possible).
>
> The directions are here:
>
> http://python.org/psf/contrib/
>
> Note that it requires a username from bugs.python.org with a (p)ython,
> not the one you might have at bugs.jython.org. Don't worry about the
> Jython-specific one, it was for past contributors, only worry about
> this one:
>
> http://www.python.org/psf/contrib/contrib-form/
>
> -Frank
>