1 要求：实现两个列表中的元素逐一配对。
2 1、普通方法:
3 >>> L1 = ['x','y','z']
4 >>> L2 = [1,2,3]
5 >>> L3 = []
6 >>> for a in L1:
7 ... for b in L2:
8 ... L3.append((a,b))
9 ...
10 >>> print L3
11 [('x', 1), ('x', 2), ('x', 3), ('y', 1), ('y', 2), ('y', 3), ('z', 1), ('z', 2), ('z', 3)]
12 ####################################################
13 2、列表解析:
14 >>> L1 = ['x','y','z']
15 >>> L2 = [1,2,3]
16 L3 = [ (a,b) for a in L1 for b in L2 ]
17 >>> print L3
18 [('x', 1), ('x', 2), ('x', 3), ('y', 1), ('y', 2), ('y', 3), ('z', 1), ('z', 2), ('z', 3)]
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