零基础学python迭代器全解二

1、print('***做判断***')L = []for i in range(1, 10): if i % 2: L.append(i*i)print(L)

2、L = [i*i for i in range(1, 10拘七呷憎) if i % 2]print(L)tmp = ['good', 'loVe', 333荑樊综鲶, 'DOG', 'black', 111]L = [s.lower() for s in tmp if isinstance(s, str)]print(L)

3、L = []for s in tmp: L.append(s.lower() if isinstance(s, str) else s)print(L)

4、L = [s.lower() if isinstance(s, str) else s for s in tmp]print(L)

5、print('*****多稍僚敉视个变量*****')tmp = [666, 222, 333]# ['1-666', '2-222', &#泌驾台佐39;3-333']L = []for i, v in enumerate(tmp): L.append('%d-%d' % (i+1, v))print(L)

6、L = ['%d-%d' % (i+1, v) for i, v in enumerate(tmp)]print(L)

7、print('******埂黉餐嚣循环嵌套******')s1 = 'abcde's2 = &垆杪屑丝#39;12345'# a1 a2 a3 a4 a5 b1 b2....L = []for x in s1: for y in s2: L.append(x+y)print(L)L = [x+y for x in s1 for y in s2]print(L)