code: def colstack(self, new, mode='abort'):
          
          if isinstance(new,list):
              return tab_colstack([self] + new,mode)
          else:
              return tab_colstack([self, new], mode)
docs: Horizontal stacking for tabarrays.
  
          Stack tabarray(s) in `new` to the right of `self`.
  
          **See also**
  
                  :func:`tabular.tabarray.tab_colstack`, 
                  :func:`tabular.spreadsheet.colstack`