Converted a list comprehension into a generator expression in query_utils.py

    name = "%s_Deferred_%s" % (model.__name__, '_'.join(sorted(list(attrs))))

    name = util.truncate_name(name, 80, 32)

    overrides = dict([(attr, DeferredAttribute(attr, model)) for attr in attrs])

    overrides = dict((attr, DeferredAttribute(attr, model)) for attr in attrs)

    overrides["Meta"] = Meta

    overrides["__module__"] = model.__module__

    overrides["_deferred"] = True