Overriding default __mul__ class implementation

DPVector.py

class DPVector(tuple):
    '''
    Dot Product (DP) Vector class that overrides the __mul__
    implementation to perform dot product operation!
    '''
    def __init__(self, tup):
        self.tup = tup

    def __mul__(self, other):
        '''
        Python will call this __mul__ whenever you attempt to multiply
        an object of this class with another.
        '''
        return self.tup[0] * other[0] + self.tup[1] * other[1]

v = DPVector((1,2))
y = DPVector((3,4))

# output: 11
print (v * y)