code: def str_lsnode(self, astr_path=""):
              
              self.sCore.reset()
              str_cwd       = self.cwd()
              if len(astr_path): self.cdnode(astr_path)
              for node in self.snode_current.d_nodes.keys():
                  self.sCore.write('%s\n' % node)
              str_ls = self.sCore.strget()
              if len(astr_path): self.cdnode(str_cwd)
              return str_ls
docs: Print/return the set of nodes branching from current node as string