又是Python初學者問題,關於空串列等等

Question

""我理解為空字串[]為空串列請問下面碼中的 args[0][:0]該理解為什麼呢用type(args[0][:0])會顯示為<class 'list'>請問它與[]有什麼不同及特性呢?我將它替換為[]後 print(adder1(["a","b"],["c","d"]))還能執行成功執行 print(adder1("god","damn","it"))就報錯了不了解其中差異..... def adder1(*args): if type(args[0])==type(0): sum = 0 else: sum = args[0][:0] for arg in args: sum = sum + arg return sum print(adder1("god","damn","it")) print(adder1(["a","b"],["c","d"]))