运行效果：
>>> [int(i) for i in str(123)]
[1, 2, 3]
>>> [int(i) for i in range(10)]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> [int(i) for i in range(1,10,2)]
[1, 3, 5, 7, 9]
>>> [int(i) for i in range(1,10,-1)]
[]
>>> [int(i) for i in range(10,1,-1)]
[10, 9, 8, 7, 6, 5, 4, 3, 2]
>>> [int(i) for i in range(10,1,-2)]
[10, 8, 6, 4, 2]
>>> i=100
>>> [int(i) for i in str(i)]
[1, 0, 0]
>>> [str(i) for i in str(i)]
['1', '0', '0']
>>> [i for i in str(i)]
['1', '0', '0']
>>>
python的各种推导式(列表推导式、字典推导式、集合推导式)：
推导式comprehensions(又称解析式)，是Python的一种独有特性。推导式是可以从一个数据序列构建另一个新的数据序列的结构体。 共有三种推导，在Python2和3中都有支持：
一、列表推导式</
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