Bpython + Django

Hi,

If you'd like to use the bpython interpreter with django, and auto-load your models, here's how you can do it.

install bpython using pip or whatever, make sure it's in your path
example:
pip install bpython

create a file in (django location)/core/management/

commands/ (I use virtualenv so for me it's in (env)/lib/python2.6/site-packages/django/core/management/ )

Name the file bpshell.py containing the code below.

and now you can run ./manage.py bpshell !!!

# Copy this file to (django location)/core/management/commands/bpshell.py
# make sure that bpython is somewhere in your path (virtual env?)
# run using ./manage.py bpshell

import os
from django.core.management.base import NoArgsCommand
from django.db.models.loading import get_models, get_apps
from optparse import make_option

class Command(NoArgsCommand):
    option_list = NoArgsCommand.option_list + (
        make_option('--plain', action='store_true', dest='plain',
            help='Tells Django to use plain Python, not bpython.'),
    )
    help = "Runs a Python interactive interpreter. Tries to use bpython, if it's available."

    requires_model_validation = False


    def handle_noargs(self, **options):
        # XXX: (Temporary) workaround for ticket #1796: force early loading of all
        # models from installed apps.
        from django.db.models.loading import get_models
        loaded_models = get_models()

        use_plain = options.get('plain', False)

        imported_objects = {}

        for app_mod in get_apps():
            app_models = get_models(app_mod)
            if not app_models:
                continue
            model_labels = ", ".join([model.__name__ for model in app_models])
            print self.style.SQL_COLTYPE("From '%s' autoload: %s" % (app_mod.__name__.split('.')[-2], model_labels))
            for model in app_models:
                try:
                    imported_objects[model.__name__] = getattr(__import__(app_mod.__name__, {}, {}, model.__name__), model.__name__)
                except AttributeError, e:
                    print self.style.ERROR_OUTPUT("Failed to import '%s' from '%s' reason: %s" % (model.__name__, app_mod.__name__.split('.')[-2], str(e)))
                    continue

        try:
            if use_plain:
                raise ImportError
            from bpython.cli import main
            locals_=imported_objects
            args=['-i', '-q']
            banner=None
            main(args, locals_, banner)            

        except ImportError:
            import code
            imported_objects = {}
            try: # Try activating rlcompleter, because it's handy.
                import readline
            except ImportError:
                pass
            else:
                # We don't have to wrap the following import in a 'try', because
                # we already know 'readline' was imported successfully.
                import rlcompleter
                readline.set_completer(rlcompleter.Completer(imported_objects).complete)
                readline.parse_and_bind("tab:complete")

            # We want to honor both $PYTHONSTARTUP and .pythonrc.py, so follow system
            # conventions and get $PYTHONSTARTUP first then import user.
            if not use_plain: 
                pythonrc = os.environ.get("PYTHONSTARTUP") 
                if pythonrc and os.path.isfile(pythonrc): 
                    try: 
                        execfile(pythonrc) 
                    except NameError: 
                        pass
                # This will import .pythonrc.py as a side-effect
                import user
            code.interact(local=imported_objects)