code: def grant_role(self, role_name, principal_name, principal_type, grantor, grantorType, grant_option):
      
      self.send_grant_role(role_name, principal_name, principal_type, grantor, grantorType, grant_option)
      return self.recv_grant_role()
docs: Parameters:
       - role_name
       - principal_name
       - principal_type
       - grantor
       - grantorType
       - grant_option