"compile()" portability

[Vio]

I would like to know if executing:

c = compile('a=5\np rint a','<string>',' exec')


on a Linux box, then pickling+beamin g the result on a Windows box, will give me the expecting result:
[color=blue][color=green][color=darkred]
>>> exec(c)[/color][/color][/color]
5

In other words, does 'compile()' generate platform-dependent code?

Regards,
Vio

[Just]

Re: &quot;compile() &quot; portability

In article <mailman.987.10 69497456.702.py thon-list@python.org >,
Vio <vmilitaru@symp atico.ca> wrote:
[color=blue]
> I would like to know if executing:
>
> c = compile('a=5\np rint a','<string>',' exec')
>
>
> on a Linux box, then pickling+beamin g the result on a Windows box, will give
> me the expecting result:
>[color=green][color=darkred]
> >>> exec(c)[/color][/color]
> 5
>
> In other words, does 'compile()' generate platform-dependent code?[/color]

If you mean "marshal" instead of "pickle", and use the same (major)
Python version on both ends, then yes.

Just

[Fredrik Lundh]

Re: &quot;compile() &quot; portability

Just wrote:
[color=blue][color=green]
> > I would like to know if executing:
> >
> > c = compile('a=5\np rint a','<string>',' exec')
> >
> > on a Linux box, then pickling+beamin g the result on a Windows box, will give
> > me the expecting result:
> >[color=darkred]
> > >>> exec(c)[/color]
> > 5
> >
> > In other words, does 'compile()' generate platform-dependent code?[/color]
>
> If you mean "marshal" instead of "pickle", and use the same (major)
> Python version on both ends, then yes.[/color]

to make sure both sites are using the same byte code revision,
check the imp.get_magic() string.

something like this should work:

code = compile(...)
data = imp.get_magic() + marshal.dumps(c ode)

...

magic = imp.get_magic()
if not data.startswith (magic):
raise ValueError("can not run this bytecode")
code = marshal.loads(d ata[len(magic):])

(len(magic) is currently 4, and will probably remain so for the
foreseeable 2.X future, but one never knows what happens in
3.X...)

</F>