Although the angle of the complex number 0 is undefined, numpy.angle(0) returns the value 0.
A complex number or sequence of complex numbers.
Return angle in degrees if True, radians if False (default).
The counterclockwise angle from the positive real axis on the complex plane in the range (-pi, pi], with dtype as numpy.float64.
Return the angle of the complex argument.
np.angle([1.0, 1.0j, 1+1j]) # in radians
np.angle(1+1j, deg=True) # in degrees
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