def __init__(self, access_key, secret_key, endpoint=None):
""" Initialize client for given query endpoint.
None as endpoint means default endpoint.
"""
self.access_key = access_key
self.kws = KWSSigner(secret_key)
api_path = '/api'
if endpoint is not None:
self.api_url = endpoint + api_path
else:
self.api_url = QUERY_ENDPOINT + api_path
self.debugging = False
