'Constructs a SigningKeyContext
:param sid: The sid
:returns: twilio.rest.api.v2010.account.signing_key.SigningKeyContext
:rtype: twilio.rest.api.v2010.account.signing_key.SigningKeyContext'

def __call__(self, sid):

    return SigningKeyContext(self._version, account_sid=self._solution['account_sid'], sid=sid)
