import numpy as np
a = np.array([1,2,3,4,5,6,7,8,9])
b = np.where (a==3,np.nan,a)
print (b) #OK, can convert certain values (e.g. 3) into np.nan
c = np.where (b==np.nan,3,b)
print (c)
import numpy as np
a = np.array([1,2,3,4,5,6,7
阅读背景：
将np.nan转换为numpy数组中的值
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