def get_commands():
    global _commands
    if _commands is None:
        _commands = dict([(name, 'django.core') for name in find_commands(__path__[0])])

        # Find the installed apps
        try:
            from django.conf import settings
            apps = settings.INSTALLED_APPS
        except (AttributeError, EnvironmentError, ImportError):
            apps = []

        # Find the project directory
        try:
            from django.conf import settings
            module = import_module(settings.SETTINGS_MODULE)
            project_directory = setup_environ(module, settings.SETTINGS_MODULE)
        except (AttributeError, EnvironmentError, ImportError, KeyError):
            project_directory = None

        # Find and load the management module for each installed app.
        for app_name in apps:
            try:
                path = find_management_module(app_name)
                _commands.update(dict([(name, app_name)
                                       for name in find_commands(path)]))
            except ImportError:
                pass # No management module - ignore this app

        if project_directory:
            # Remove the "startproject" command from self.commands, because
            # that's a django-admin.py command, not a manage.py command.
            del _commands['startproject']

            # Override the startapp command so that it always uses the
            # project_directory, not the current working directory
            # (which is default).
            from django.core.management.commands.startapp import ProjectCommand
            _commands['startapp'] = ProjectCommand(project_directory)

    return _commands
Returns a dictionary mapping command names to their callback applications.
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/core/management/__init__.py/get_commands