On Sun, Sep 28, 2008 at 7:10 AM, David Pratt <[EMAIL PROTECTED]> wrote:
> Hi. I am in the midst of preparing a package to convert between various
> schemas including orms. The issue is I don't want django, slqalchemy, storm,
> rdflib etc. as hard dependencies of the package. Each module is a schema to
> schema conversion. As an example, I have imports for sqlalchemy with classes
> and methods that use them.
>
> from sqlalchemy.util import OrderedDict
> from sqlalchemy import types as rdbtype
> import sqlalchemy as sa
>
> I have my own ideas about how I might do this but looking for
> recommendations from others how they would handle this so the result would
> be:
>
> 1. no hard dependencies on any of these other packages
> 2. load the module without failure.
> 3. import the dependent package if available to perform the conversion
Why not just catch the ImportError-s and set some variables depending
on whether you were able to import the modules, e.g.:
# repeat for each soft-depended module
try:
import django_module
except ImportError:
imported_django = False
else:
imported_django = True
#later in the file
if imported_django and imported_sqlalchemy:
class DjangoToSqlAlchemy(object):
#code that uses the django and sqlalchemy modules here
Regards,
Chris
--
Follow the path of the Iguana...
http://rebertia.com
>
> Many thanks
> David
> --
> http://mail.python.org/mailman/listinfo/python-list
>
--
http://mail.python.org/mailman/listinfo/python-list
