Python uses struct.pack to pack knowledge points

packed array

		chead_finish = ""
		chead_finishdata = b''
		if len(self.guide_finish) > 0:
			chead_finish = str(len(self.guide_finish))+"i"
			#或者chead_finish = len(self.guide_finish)*"i"
			chead_finishdata = struct.pack(chead_finish,*self.guide_finish)