def __init__(self, model_class=None, keys_only=False, cursor=None):
    super(Query, self).__init__(model_class, keys_only, cursor=cursor)
    self.__query_sets = [{}]
    self.__orderings = []
    self.__ancestor = None
Constructs a query over instances of the given Model.
dataset/ETHPy150Open CollabQ/CollabQ/.google_appengine/google/appengine/ext/db/__init__.py/Query.__init__