# File lib/cucumber/parser/feature.rb, line 1537
      def _nt_py_string
        start_index = index
        if node_cache[:py_string].has_key?(index)
          cached = node_cache[:py_string][index]
          @index = cached.interval.end if cached
          return cached
        end

        i0, s0 = index, []
        r1 = _nt_open_py_string
        s0 << r1
        if r1
          s2, i2 = [], index
          loop do
            i3, s3 = index, []
            i4 = index
            r5 = _nt_close_py_string
            if r5
              r4 = nil
            else
              @index = i4
              r4 = instantiate_node(SyntaxNode,input, index...index)
            end
            s3 << r4
            if r4
              if index < input_length
                r6 = instantiate_node(SyntaxNode,input, index...(index + 1))
                @index += 1
              else
                terminal_parse_failure("any character")
                r6 = nil
              end
              s3 << r6
            end
            if s3.last
              r3 = instantiate_node(SyntaxNode,input, i3...index, s3)
              r3.extend(PyString0)
            else
              @index = i3
              r3 = nil
            end
            if r3
              s2 << r3
            else
              break
            end
          end
          r2 = instantiate_node(SyntaxNode,input, i2...index, s2)
          s0 << r2
          if r2
            r7 = _nt_close_py_string
            s0 << r7
          end
        end
        if s0.last
          r0 = instantiate_node(SyntaxNode,input, i0...index, s0)
          r0.extend(PyString1)
          r0.extend(PyString2)
        else
          @index = i0
          r0 = nil
        end

        node_cache[:py_string][start_index] = r0

        r0
      end