Python list parsing

#！ /bin/env python

#这句会生成一个列表 [0,1,2,3,4,5,6,7,8,9]

List_a = [item for item ' in range (10)]

#下面对这个列表进行筛选 (conditions are even)

List_b = [item for item in List_a if (item%2==0)]

#这样就可以筛选出列表中的偶数

#其实列表解析可以看成是这样的

#[variable (or variable operation expression) iterator (an iterative object is equivalent to a For loop) filter condition]

#下面这个会生成0-10 squared

List_c = [item**2 for item in range (11)]

#当然也是可以添加判断条件的

#list_c = [item**2 for item in range (one) if (item%2 ==0)]

#请读者自行上机调试

#俗话说: The eye times, better hand over again

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Python list parsing