def sub(self, a, b):
if isinstance(a, float):
if isinstance(b, float):
return a - b
elif isinstance(b, Complex):
return Complex.sub(Complex(a), b)
elif isinstance(b, Matrix):
raise ComputorException('Illegal operation: Rational - Matrix')
elif isinstance(a, Complex):
if isinstance(b, float):
return Complex.sub(a, Complex(b))
elif isinstance(b, Complex):
return Complex.sub(a, b)
elif isinstance(b, Matrix):
raise ComputorException('Illegal operation: Complex - Matrix')
elif isinstance(a, Matrix):
if isinstance(b, float):
raise ComputorException('Illegal operation: Matrix - Rational')
elif isinstance(b, Complex):
raise ComputorException('Illegal operation: Matrix - Complex')
elif isinstance(b, Matrix):
return Matrix.sub(a, b)
raise ComputorException('Computor.sub(): something bad happened 🤷')
