code: def putcol(self, columnname, value, startrow=0, nrow=-1, rowincr=1):
          
          self._putcol(columnname, startrow, nrow, rowincr, value)
docs: Put an entire column or part of it.
  
          If the column contains scalar values, the given value should be a 1-dim
          array. Otherwise it is a numpy array where the first axis is formed by
          the column cells.
  
          The column can be sliced by giving a start row (default 0), number of
          rows (default all), and row stride (default 1).