usages.py 文件源码

def list(self,search_opts=None):

        if search_opts is None:
            search_opts = {}

        qparams = {}

        for opt, val in six.iteritems(search_opts):
            if val:
                qparams[opt] = val

        # Transform the dict to a sequence of two-element tuples in fixed
        # order, then the encoded string will be consistent in Python 2&3.
        if qparams:
            items = list(qparams.items())
            new_qparams = sorted(items, key=lambda x: x[0])
            query_string = "?%s" % parse.urlencode(new_qparams)
        else:
            query_string = ""

        return self._list("/usages%s" % (query_string), "usages")