Maurice LING wrote:
Terry Reedy wrote:
"Maurice LING" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
Say I code my stuffs in Jython (importing java libraries) in a file
"text.py"
Just to be clear, Jython is not a separate langague that you code
*in*, but a separate implementation that you may slightly differently
code *for*.
Yes, I do get this point rightly. Jython is just an implementation of
Python virtual machine using Java. I do note that there are some
differences, such as, Jython can only handle pure python modules.
However, I'm not a language expert to differentiate language differences
between these 2 implementations of Python, as in Jython and CPython. If
someone care to enlighten, it will be my pleasure to consult. TIA.
That's not strictly correct. The Python virtual machine isn;t
implemented at all in Jython, instead the JVM is used as the compilation
target.
... Will there be any issues when I try to import text.py into CPython?
If text.py is written in an appropriate version of Python, it itself
will cause no problem. Hoqwever, when it imports javacode files, as
opposed to CPython bytecode files, CPython will choke.
In my example, the file "text.py" is coded in Jython, importing Java
libraries. I do get that I cannot import Java jar files directly into
CPython. What I do not get is that what is so special about Jython that
it can "fool" CPython into using Java libraries... or is that there will
always be a need for Java virtual machine and Python virtual machine
when I use Java libraries in Jython... and importing Jython coded files
into CPython....
Jython is pretty much a Python interpreter that compiles Python into JVM
bytecodes. Consequently the amount of "trickery" involved is rather
less, though clearly there is some (automated conversion b etween Java
and Pythin data types where appropriate, and automated signature-based
selection of the appropriate Java method being the two most obvious).
regards
Steve
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