code: def update_acell(self, label, value):
          
          return self.update_cell(*(a1_to_rowcol(label)), value=value)
docs: Updates the value of a cell.
  
          :param label: Cell label in A1 notation.
                        Letter case is ignored.
          :type label: str
          :param value: New value.
  
          Example::
  
              worksheet.update_acell('A1', '42')