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列表解析(list comprehension)
A2 = [i for i in A1 if i in A0]
其实等同于
A2 = []for i in A1: if i in A0: A2.append(i)
所以就可以玩出很多花来了,包含列表的交集、差集等等。
代码:
#!/usr/bin/python# -*- coding: UTF-8 -*-"""Created by liaoyangyang1 on 2018/2/28 下午9:26."""A0 = dict(zip(('a','b','c','d','e'),(1,2,3,4,5)))A1 = range(10)A2 = [i for i in A1 if i in A0]A3 = [A0[s] for s in A0]A4 = [i for i in A1 if i in A3]A5 = {i:i*i for i in A1}A6 = [[i,i*i] for i in A1]
执行结果:
/Users/liaoyangyang/crc/codes-python/LearnPython/venv/bin/python /Users/liaoyangyang/crc/codes-python/LearnPython/test.pyA0:{'a': 1, 'c': 3, 'b': 2, 'e': 5, 'd': 4}A1:[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]A2:[]A3:[1, 3, 2, 5, 4]A4:[1, 2, 3, 4, 5]A5:{0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49, 8: 64, 9: 81}A6:[[0, 0], [1, 1], [2, 4], [3, 9], [4, 16], [5, 25], [6, 36], [7, 49], [8, 64], [9, 81]]Process finished with exit code 0