Embedding questions

[Olaf Appelt]

Hi Fredrik,

thank you very much. I'll look into this.


Olaf


Fredrik Lundh <fredrik at pythonware.com> wrote in message
news:00a401bf422a$28ae6280$f29b12c2 at secret.pythonware.com...
> Olaf Appelt <tholap at compuserve.com> wrote:
> > Furthermore I want to avoid having module files lying around in
directories.
> > The code should be compiled, go into database and later be read from db
to
> > be executed. All that without going files. Just strings moved between
Python
> > API and DB.
> >
> > Is that possible?
>
> Greg Stein's imputil.py [1] allows you to modify the
> import statement so it can pick up code from any
> data source.
>
> an example (assuming "db" is a database object which
> works pretty much like a code string dictionary).
>
> ...
>
> class DatabaseImporter(Importer):
>
>     def __init__(self, db):
>         self.__db = db
>
>     def get_code(self, parent, modname, fqname):
>         # is it a module?
>         try:
>             code = marshal.loads(self.__db[fqname])
>             return 0, code
>         except KeyError:
>             pass
>         # is it a package?
>         try:
>             fqname = fqname + ".__init__"
>             code = marshal.loads(self.__db[fqname])
>             return 1, code
>         except KeyError:
>             pass
>         return None # not found in this database
>
> # prepends the database to the import chain
> DatabaseImporter(mydb).install()
>
> ...
>
> to compile python source code into code strings, use:
>
>     string = marshal.dumps(compile(source, filename, "exec"))
>
> ...
>
> hope this helps!
>
> </F>
>
> 1) http://www.lyra.org/greg/python/imputil.py