CPython vs. Jython/JPython

[D-Man]

That's a very different coding style and sounds very interesting.  Writning a project in multiple languages, but using each one naturally.

BTW, can stackless python be implemented in Java?  I don't have any real experience but from reading the paper on it it seems that stackless python simply creates it's own python stack (on the C heap).  Then the interpreter creates python frames and pushes them on the python stack,  then returns from the C frames.  It then executes the python frames independent of the C stack.

-D


On Wed, 01 Nov 2000 18:46:57 Arnold de Vos wrote:
 | I don't post to the group much but I *have* to chime in here with a bouquet
 | for JPython/Jython.   The Java/Python synergy is unique, I know of nothing
 | like it anywhere else.  You just have to experience it.
 | 
 | In the past, we've implemented a big app in CPython with C extensions and
 | found it a very fast way to develop clean and reliable software.  We will do
 | more of that.
 | 
 | But the mixed Java/Python environment is something quite different that I've
 | never seen before.  You don't write "java extensions" and "Python glue".
 | You literally mix the two languages on a per-class or per-package basis.
 | 
 | I wonder if this is approximately what Python 3000 could look like where
 | type-safe and "dynamic-mode" modules are mixed?
 | 
 | - Arnold
 | 
 | ---
 | Arnold deVos
 | Langdale Consultants
 | adv at langdale.com.au
 | 
 | 
 | 
 | Guido van Rossum <guido at beopen.com> wrote in message
 | news:cpd7gijt1d.fsf at cj20424-a.reston1.va.home.com...
 | > You are all wrong. :-)
 | >
 | > The key difference between CPython and JPython is not speed, but
 | > available extensions.  CPython is useful as a glue language for C/C++
 | > library code.  There are lots of examples, e.g. NumPy, Tkinter, PIL,
 | > and so on.  JPython is useful as a glue language for Java library
 | > code, e.g. Swing, JavaBeans, Jave 2 Enterprise Edition APIs, and so
 | > on.
 | >
 | > If only CPython existed, linking to Java code would be very
 | > cumbersome: you'd have to wrap a JVM in a CPython extension and take
 | > it from there.  If only JPython existed, linking to C/C++ code would
 | > be impossible (in situations where JNI is not available) or at best
 | > cumbersome (wrapping C/C++ code in JNI is much more painful than
 | > writing Python wrappers, because of the JVM's garbage collector).
 | >
 | > It's sometimes possible to use C/C++ code from JPython (e.g. Finn Bock
 | > did a wrapper for _tkinter) but rarely convenient.  I haven't heard of
 | > anyone linking to a JVM from CPython.
 | >
 | > Of course, the fact that there are two different implementations means
 | > that an app that requires the use of both a library written in C/C++
 | > and one written in Java is out of luck.  Fortunately, most of the
 | > standard extensions (e.g. regular expressions) are available in both
 | > CPython and JPython.
 | >
 | > In the rare case where you need two non-standard extensions, you could
 | > write your program as two communicating processes, one using JPython,
 | > one using CPython.
 | >
 | > --Guido van Rossum (home page: http://www.python.org/~guido/)
 | 
 | 
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 |