code: def del_attr(self, name):
          
          if name in self.namespace:
              if name in self.cells:
                  self.del_cells(name)
              elif name in self.spaces:
                  self.del_space(name)
              elif name in self.refs:
                  self.del_ref(name)
              else:
                  raise RuntimeError("Must not happen")
          else:
              raise KeyError("'%s' not found in Space '%s'" % (name, self.name))
docs: Implementation of attribute deletion
  
          ``del space.name`` by user script
          Called from ``StaticSpace.__delattr__``