code: def prepare_for_request(self, discharge_macaroon):
          ''' Return a new discharge macaroon bound to the receiving macaroon's
          current signature so that it can be used in a request.
  
          This must be done before a discharge macaroon is sent to a server.
  
          :param discharge_macaroon:
          :return: bound discharge macaroon
          '''
          protected = discharge_macaroon.copy()
          return HashSignaturesBinder(self).bind(protectedf prepare_for_request(self, discharge_macaroon):
          ''' Return a new discharge macaroon bound to the receiving macaroon's
          current signature so that it can be used in a request.
  
          This must be done before a discharge macaroon is sent to a server.
  
          :param discharge_macaroon:
          :return: bound discharge macaroon
          '''
          protected = discharge_macaroon.copy()
          return HashSignaturesBinder(self).bind(protected)
docs: Return a new discharge macaroon bound to the receiving macaroon's
          current signature so that it can be used in a request.
  
          This must be done before a discharge macaroon is sent to a server.
  
          :param discharge_macaroon:
          :return: bound discharge macaroon