code: def recalc(self, sheet=None):
          'reset column cache, attach to sheet, and reify name'
          if self._cachedValues:
              self._cachedValues.clear()
          if sheet:
              self.sheet = sheet
          self.name = self._namf recalc(self, sheet=None):
          'reset column cache, attach to sheet, and reify name'
          if self._cachedValues:
              self._cachedValues.clear()
          if sheet:
              self.sheet = sheet
          self.name = self._name
docs: reset column cache, attach to sheet, and reify name