Python compilation ??

John Nagle nagle at animats.com
Tue Jul 3 07:03:21 CEST 2007


Evan Klitzke wrote:
> On 7/2/07, Cathy Murphy <cathy at nachofoto.com> wrote:
> 
>> Is python a compiler language or interpreted language. If it is 
>> interpreter
>> , then why do we have to compile it?
> 
> 
> It's an interpreted language. It is compiled into bytecode (not
> machine code) the first time a script is run to speed up subsequent
> executions of a script.

   CPython compiles to an intermediate form, rather than
all the way to machine code, and executes the intermediate form,
which is basically a tree, with an interpreter written in C.

   ShedSkin Python compiles to C++, then all the way to machine code.
Some CPython features have to be disallowed, but there's a huge
performance gain.

   Jython compiles to Java byte code, which is then compiled to
machine code by a just-in-time compiler.

   Iron Python compiles to Microsoft's byte code as used by their
".NET" common language runtime.  This is then compiled to machine
code by a just-in-time compiler.

				John Nagle



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