Re: [Jython-users] Jython/Thinking in Patterns Question

[<bc...@wo...>]

[Uncle Roastie]

>I'm operating under the impression that JPython cannot use CPython code.

That depends on the module. Most modules works with both Jython and
CPython.

>Brian Zimmer's additional comment suggests the same thing that
>John Mudd says - just import glob from CPython.

Correct. In fact the glob.py module distributed with Jython-2.0 is a
binary copy taken from CPython-2.0

>There is something conceptually that I'm missing here.
>Why isn't something like the CPython glob module a part of
>the JPython distribution 

It is. It will be installed when the "Library modules" checkbox is
selected during installation.

>if they can interoperate?  Are we expected to
>have both distributions on our search paths -

No. By default the installation will install a selfcontained jython
environment. Some users with more advanced requirements can have both
distributions on the search path.

>but then, if that is
>the case, why does JPython duplicate so much of CPython?

???

What are you saying here? A major part of the CPython standard library
is distributed with Jython exactly because that part works with Jython.

>There is some missing concept here that I haven't pick up on.
>I don't think JPython and CPython are meant to interoperate.

Yes they are. To the fullest extend possible.

>Bruce Eckels says in his excellent "Thinking in Patterns" that
>you can use things like the glob module,  but where does it come from,
>since it's not in JPython/Jython, 

It is in Jython-2.0.

>and I'm still making the assumption
>that CPython and JPython do not interoperate?

Not all CPython modules can work in jython. Some modules depend on
dll/.so extension, others depend on the CPython implementation such as
the Python byte codes and yet other modules fails because of bugs in
Jython.

>I think the answer hasn't been made yet, which is why I'm still asking
>questions.

I hope the question have been answered now.

regards,
finn