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@classmethod
    def fromlist(cls, v):
        if not isinstance(v, list):
            raise TypeError
        inst = cls()
        inst.v = v
        return inst

def __repr__(self):
        args = ', '.join(repr(x) for x in self.v)
        return 'Vec({})'.format(args)

def __len__(self):
        return len(self.v)

def __getitem__(self, i):
        return self.v[i]

def __add__(self, other):
        # Element-wise addition
        v = [x + y for x, y in zip(self.v, other.v)]
        return Vec.fromlist(v)

def __sub__(self, other):
        # Element-wise subtraction
        v = [x - y for x, y in zip(self.v, other.v)]
        return Vec.fromlist(v)

def __mul__(self, scalar):
        # Multiply by scalar
        v = [x * scalar for x in self.v]
        return Vec.fromlist(v)

__rmul__ = __mul__

def test():
    import doctest
    doctest.testmod()

test()

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