在理解中链式磁发生器

Question

在python中，如果生成的语法是可读的，那么是否可以像下面这样作为一个单行程序来执行？你知道吗

d = dict((i,i+1) for i in range(10))
d.update((i,i+2) for i in range(20,25))

Answer 1

这个怎么样：

d = dict(dict((i,i+1) for i in range(10)), **dict(((i,i+2) for i in range(20,25))))

结果：

{0: 1, 1: 2, 2: 3, 3: 4, 4: 5, 5: 6, 6: 7, 7: 8, 8: 9, 9: 10, 20: 22, 21: 23, 22: 24, 23: 25, 24: 26}

Answer 2

>>> from itertools import chain
>>> dict(chain(((i,i+1) for i in range(10)), 
               ((i,i+2) for i in range(20,25))))
{0: 1, 1: 2, 2: 3, 3: 4, 4: 5, 5: 6, 6: 7, 7: 8, 8: 9, 9: 10, 20: 22, 21: 23, 22: 24, 23: 25, 24: 26}

Answer 3

@jamylak的回答很好，应该这样做。无论如何，对于这个特定的问题，我可能会这样做：

d = dict((i, i+1) if i < 10 else (i, i+2) for i in range(25) if i < 10 or i >= 20)