def nearby(self, x, y):
        result = []
        i, j = self.normalize(x, y)
        for p in xrange(i - 2, i + 3):
            for q in xrange(2 - j, j + 3):
                if (p, q) in self.cells:
                    result.append(self.cells[(p, q)])
        return result
dataset/ETHPy150Open fogleman/pg/pg/poisson.py/Grid.nearby/swapped operands of `-`