li = [1, 2, 3, '456', [1, 2, 3], {1: 'one', 2: 'two'}] print(type(list)) print(type(li)) # 元素访问 print(li[0]) print(li[-1]) # li[len(li) - 1] print(li[-2]) # li[len(li) - 2] # 查找元素位置 print(li.index('456')) print(li.index([1, 2, 3])) # print(li.index(-1)) # 添加元素 l_a = [1, 2, 3] l_a.append(4) l_a.append(5) l_b = [6, 7, 8] l_a.extend(l_b) # 试下用append是什么结果 print(l_a) l_a = [] if not l_a: print('Empty') # not XX和is None不是一回事 if len(l_a) == 0: print('Empty') for i in li: print(i) for i in range(len(li)): print(li[i]) t = (1, 2, 3, '456') print(type(t))#只读 # t[0] = 'a' # t.append('x') del(li[-1]) # del(list[index]) del(li[1]) del(li[-2]) print(li)
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