매직 메소드 (Special Method) - 2

# 클래스 예제 2
# (5,2) + (4,3) = (9,5)
# (10,3) * 5 = (50,15)
# Max((5,10)) = 10

class Vector(object):
    def __init__(self, *args):
        '''
        Create a vector, example : v = Vector(5, 10)
        '''
        if len(args) == 0:
            self._x, self._y = 0, 0
        else:
            self._x, self._y = args
            
    def __repr__(self):
        '''
        Return the vector informations
        '''
        return 'Vector(%r, %r)' % (self._x, self._y)
    
    def __add__(self, other):
        '''
        Return the vector addtion of self and other
        '''
        return Vector(self._x + other._x, self._y + other._y)
    
    def __mul__(self, y):
        return Vector(self._x * y, self._y * y)
    
    def __bool__(self):
        return bool(max(self._x, self._y))
    

# Vector 인스턴스 생성
v1 = Vector(5,7)
v2 = Vector(23, 55)
v3 = Vector()

# 매직 메소드 출력
print(Vector.__init__.__doc__)
print(Vector.__repr__.__doc__)
print(Vector.__add__.__doc__)
print(v1, v2, v3)
print(v1 + v2)
print(v1 * 3)
print(v2 * 10)
print(bool(v1), bool(v2),bool(v3))