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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def lstr_lsnode(self, astr_path=""):
 """ Return the string names of the set of nodes branching from current node as list of strings """

            self.sCore.reset()
            str_cwd       = self.cwd()
            if len(astr_path): self.cdnode(astr_path)
            lst = self.snode_current.d_nodes.keys()
            if len(astr_path): self.cdnode(str_cwd)
            return lst