code: def diffsp(self, col: str, serie: "iterable", name: str="Diff"):
          
          try:
              d = []
              for i, row in self.df.iterrows():
                  v = (row[col]*100) / serie[i]
                  d.append(v)
              self.df[name] = d
          except Exception as e:
              self.err(e, self._append, "Can not diff column from serie")
docs: Add a diff column in percentage from a serie. The serie is 
          an iterable of the same length than the dataframe
  
          :param col: column to diff
          :type col: str
          :param serie: serie to diff from
          :type serie: iterable
          :param name: name of the diff col, defaults to "Diff"
          :param name: str, optional
  
          :example: ``ds.diffp("Col 1", [1, 1, 4], "New col")``