python def linear_interpolation: x1, x2 = x y1, y2 = y return y1 + * /

def newtoninterpolation: n = len if n == 0: return y else: return - newtoninterpolation) /

def lagrange_interpolation: n = len result = 0 for i in range: li = 1 for j in range: if i != j: li *= / result += y * li return result

xpoints = ypoints = z = 2.5

linearval = linearinterpolation print

lagrangeval = lagrangeinterpolation print

newtonval = newtoninterpolation print

这段代码定义了三种插值方法的函数，并给了它们的示例用法。线性插值、拉格朗日插值和牛顿插值dou是基于不同的数学原理来估摸着未知数据点的值。代码中还包括了怎么用这些个函数的示例。