code: def update_column(self, header, column):
          
          index = self.get_column_index(header)
          if not isinstance(header, basestring):
              raise TypeError("header must be of type str")
          for row, new_item in zip(self._table, column):
              row[index] = new_item
docs: Update a column named `header` in the table.
  
          If length of column is smaller than number of rows, lets say
          `k`, only the first `k` values in the column is updated.
  
          Parameters
          ----------
          header : str
              Header of the column
  
          column : iterable
              Any iterable of appropriate length.
  
          Raises
          ------
          TypeError:
              If length of `column` is shorter than number of rows.
  
          ValueError:
              If no column exists with title `header`.