code: def update(self, table_name, set_query, where=None):
          
  
          self.validate_access_permission(["w", "a"])
          self.verify_table_existence(table_name)
  
          query = SqlQuery.make_update(table_name, set_query, where)
  
          return self.execute_query(query, logging.getLogger().findCaller())
docs: Execute an UPDATE query.
  
          Args:
              table_name (|str|):
                  Table name of executing the query.
              set_query (|str|):
                  ``SET`` clause for the update query.
              where (|arg_where_type| , optional):
                  ``WHERE`` clause for the update query.
                  Defaults to |None|.
  
          Raises:
              IOError:
                  |raises_write_permission|
              simplesqlite.NullDatabaseConnectionError:
                  |raises_check_connection|
              simplesqlite.TableNotFoundError:
                  |raises_verify_table_existence|
              simplesqlite.OperationalError:
                  |raises_operational_error|