[Chicago] exec saved compiled code

[Massimo Di Pierro]

almost... but I want to be able to save c and reload it before the  
exec. It appears c cannot be picked.

Massimo

On Aug 29, 2007, at 2:28 AM, Cosmin Stejerean wrote:

> I'm not sure if I understand what's going on with the environment =  
> {} part so I'm not sure if my solution to your problem is correct  
> but here is what I think is wrong. As far as I can tell exec can  
> take either a string or a code object. exec(open(' a.py','r').read 
> ()) works because you are reading the code from a file (it could  
> have been any other file extension) and exec is parsing it.
>
> exec(open('a.pyc','r').read()) this however reads the bytecode as a  
> string and passes it to exec. This is probably not what you want  
> (and most likely won't work). One solution is to simply import a,  
> but I'm guessing that's not what you want either. The other option  
> is to not use py_compile but use the compile function and pickle as  
> follows
>
> c = compile("print x", '<string>', 'exec')
>
> now you have a code object that you can execute
>
> exec(c)
>
> If you pickle this code object to a file you will be able to read  
> it and run it (then again why not pickle the original string??).  
> The problem is pickle won't pickle code objects. But apparently you  
> can use a little trick around that (see http://mail.python.org/ 
> pipermail/python-list/2002-August/161661.html)
>
> Is this at least close to what you were looking for?
>
> - Cosmin
>
> On 8/29/07, Massimo Di Pierro <mdipierro at cti.depaul.edu > wrote:
>
> Hello,
>
> I am hoping one of you can help me with this.
>
> EXAMPLE:
>
> environment={'x':3}
> open('a.py','w').write('print x')
> import py_compile,os
> exec(open('a.py','r').read()) in environment ### prints 3 OK!
> py_compile.compile(' a.py')
> os.unlink('a.py')
> exec(open('a.pyc','r').read()) in environment ### does not work
>
> QUESTION: how do exec a.pyc into environment so that it prints 3? Is
> it possible to do it?
>
> Massimo
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