code: def visibleCols(self):  # non-hidden cols
          'List of `Column` which are not hidden.'
          return self.keyCols + [c for c in self.columns if not c.hidden and not c.keycolf visibleCols(self):  # non-hidden cols
          'List of `Column` which are not hidden.'
          return self.keyCols + [c for c in self.columns if not c.hidden and not c.keycol]
docs: List of `Column` which are not hidden.