help where is z axis?

[43998213]

ekf = EKF(gyr=gyr_data, acc=acc_data)
ekf.Q.shape
(1000, 4)

i tried :
r = math.atan2(2*(wx+yz),1-2*(xx+yy))
p = math.asin(2*(wy-zz))
y = math.atan2(2*(wz+xy),1-2*(zz+yy))

angleR = r180/math.pi
angleP = p180/math.pi
angleY = y*180/math.pi
but angleY are 0
any help will be thanks