def _canonicalize(self, parameters):
        parameters = parameters.items()
        parameters.sort(lambda x, y:cmp(x[0], y[0]))
        return "&".join([safe_quote_tuple(x) for x in parameters])
Canonicalize parameters for use with AWS Authorization.
dataset/ETHPy150Open wehriam/awspider/awspider/aws/productadvertising.py/AmazonProductAdvertising._canonicalize