code: def isin(self, column, compare_list):
          
          return [x in compare_list for x in self._data[self._columns.index(column)]]
docs: Returns a boolean list where each elements is whether that element in the column is in the compare_list.
  
          :param column: single column name, does not work for multiple columns
          :param compare_list: list of items to compare to
          :return: list of booleans