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GeezerVison is showing github.com — python_test/test5.py at master · Hanlen520/python_test Expand file tree/ Copy pathtest5.pyMore file actions 22 lines (17 loc) · 599 Bytes / Copy pathtest5.pyFile metadata and controls22 lines (17 loc) · 599 Bytes 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 # 练习列表生成式,这个很好用，越用越爽 l = [x for x in range(10)] print(l) # 还可以加条件来筛选元素,这里筛选偶数 l = [x for x in range(10) if x % 2 == 0] print(l) # 对两个列表生成一个也可以,生成全排列 l = [x + y for x in 'XYZ' for y in 'abc'] print(l) # 也可以生成字典 d = {x:y for x in 'xyz' for y in 'ABC'} print(d) # 作业：将列表的字符串的大写改成小写，不是字符串的就去掉 L1 = ['Hello', 'World', 18, 'Apple', None] print(L1) L2 = [s.lower() for s in L1 if isinstance(s,str)] print(L2) |
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