>>> arg(complex(1,-1)) -0.7853981633974484 >>> arg(complex(1,1)) 0.7853981633974484 >>> arg(complex(-1,1)) 2.356194490192345 >>> arg(complex(-1,-1)) -2.356194490192345 >>> phase(complex(1,-1)) -0.7853981633974483 >>> phase(complex(1,1)) 0.7853981633974483 >>> phase(complex(-1,-1)) -2.356194490192345 >>> phase(complex(-1,1)) 2.356194490192345