def default_package(self):
        """
        ::
        
            GET /:login/packages
        
        :Returns: the default package for this datacenter
        :rtype: :py:class:`dict` or ``None``
        
        Requests all the packages in this datacenter, filters for the default, 
        and returns the corresponding dict, if a default has been defined.
        """
        packages = [pk for pk in self.packages() 
                        if pk.get('default') == 'true']
        if packages:
            return packages[0]
        else:
            return None