以下是 Python 实现：

class Point: def init(self, x, y): self.x = x self.y = y

def distance(self, x2, y2):
    return ((self.x - x2) ** 2 + (self.y - y2) ** 2) ** 0.5

测试

p = Point(0, 0) print(p.distance(3, 4)) # 输出 5.0