def __sub__(self, other):
        out, i, j, u, v = [], 0, 0, self.value, other.value
        try:
            while True:
                if u[i][0] < v[j][0]:
                    i += 1
                    out.append( ( i, u[i][1] ) )
                elif u[i][0] > v[j][0]:
                    j += 1
                    out.append( ( i, -v[j][1] ) )
                else:
                    i, j = i+1, j+1
                    out.append( ( i, u[i][1]-v[j][1] ) )
        except __HOLE__:
            return Vector(tuple(out))
dataset/ETHPy150Open mollyproject/mollyproject/molly/wurfl/vsm.py/Vector.__sub__