对numpy中布尔型数组的处理方法详解
布尔数组的操作方式主要有两种，any用于查看数组中是否有True的值，而all则用于查看数组是否全都是True。
如果用于计算的时候，布尔量会被转换成1和0，True转换成1，False转换成0。通过这种方法可以统计一个布尔量数组中True的个数。
如果普通的数组用于布尔类操作，也会有类似的数据类型转换。其中，非0的数值转换成True，而0则被转换成False。
In[30]:arr=randn(100)
In[31]:arr
Out[31]:
array([1.38474589,-1.51489066,-0.81053544,1.47875437,-0.53638642,
0.09856211,1.39931492,-0.04226221,-0.66064836,0.31829036,
-0.33759781,-0.35793518,0.66974626,1.5989403,0.98361013,
0.0209635,-0.56165749,0.59473585,-0.06956145,-0.50384339,
-0.51207066,-0.41794862,2.12230002,0.55457739,-0.83156748,
-1.5609328,-0.72414846,-0.24781724,2.1523153,-1.35802819,
1.75644258,1.66794885,-0.30311682,0.29060339,-0.18960502,
-0.91537419,-0.10277047,0.06899507,0.1535801,0.5281243,
-0.49951785,0.26074368,-0.04215356,-0.29765383,-0.77197024,
0.72333408,-0.9656567,-0.04391422,-0.53504402,-0.3695063,
-0.57323435,-0.09923021,-0.8819845,-0.31904228,-0.34805511,
-1.39372713,-0.32243494,1.18074562,-0.77189808,0.14011272,
-0.12029721,0.91164114,0.3052017,-0.45764259,0.73858783,
0.67327449,0.84294828,0.54471476,0.8300902,-0.21001427,
-0.8247486,0.29870036,-0.71204709,0.46825521,-0.76507537,
-0.67755756,1.38798882,0.44536155,0.41104869,-0.24990925,
-0.38003931,1.13801121,0.19761371,0.84638972,1.05816446,
-0.03591458,2.35862529,1.69183501,0.77490116,-1.47556029,
-0.54755786,-0.93202001,0.69240349,-0.02720469,0.49363318,
0.55501151,-1.67184849,-1.61725652,-0.95964244,0.12177363])
In[32]:arr>0
Out[32]:
array([True,False,False,True,False,True,True,False,False,
True,False,False,True,True,True,True,False,True,
False,False,False,False,True,True,False,False,False,
False,True,False,True,True,False,True,False,False,
False,True,True,True,False,True,False,False,False,
True,False,False,False,False,False,False,False,False,
False,False,False,True,False,True,False,True,True,
False,True,True,True,True,True,False,False,True,
False,True,False,False,True,True,True,False,False,
True,True,True,True,False,True,True,True,False,
False,False,True,False,True,True,False,False,False,True],dtype=bool)
In[33]:(arr>0).sum()
Out[33]:46
In[34]:arr.any()
Out[34]:True
In[35]:arr.all()
Out[35]:True
In[36]:(arr>0).all()
Out[36]:False
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