import numpy as np

a = np.ma.zeros([2,10,10])
ma1 = np.ma.getmaskarray(a)
ma2 = np.ma.getmaskarray(a)
ma1[0,0:5,1:4] = True
ma1[1,6:9,5:7] = True
ma3 = np.logical_or(ma1,ma2)
print(ma3)
#a.mask = ma
#print(a)
#print(a.mask)