On Wed, Apr 8, 2009 at 7:27 AM, J <jlin.li...@gmail.com> wrote:

I'm fairly new to web development and AppEngine. I'm wondering if it's
> possible to use both Python and Java in AppEngine. Certain modules
> would be written in Python and other are written in Java. Why or why
> not?
>

An application can only use one of the two runtime environments at one time,
either the Java (JVM) environment or the Python environment.  Specifically,
each version of an app can only use one environment: you can upload a Python
app with a version of "1" and a Java app with a version of "2", though only
one version can be the "default" version for the application at one time.

If you just want to use the Python language with Java technology, consider
using Jython, a Python interpreter that runs on the JVM.  We don't yet have
the Python App Engine APIs implemented in a way that would work with Jython
in the Java environment, though the Python SDK is open sourced so you could
make a project of it.  :)

-- Dan


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