data.py 文件源码

def magnitude(self):
                        if hasattr(self, '_m_magnitude'):
                            return self._m_magnitude if hasattr(self, '_m_magnitude') else None

                        self._m_magnitude, self._m_angle = cmath.polar(
                            complex(self.real, self.imaginary))
                        return self._m_magnitude if hasattr(self, '_m_magnitude') else None