code: def has_column(self, table, column):
          
          column = column.lower()
  
          return column in list(map(lambda x: x.lower(), self.get_column_listing(table)))
docs: Determine if the given table has a given column.
  
          :param table: The table
          :type table: str
  
          :type column: str
  
          :rtype: bool