python float型(小数型)等差数列相等间隔列表生成

def PolynomialFunc(R):
    a8 = 9.536789998906224e-14
    a7 = -1.6140913734735798e-11
    a6 = 1.23390327559906e-09
    a5 = -5.6346849959531704e-08
    a4 = 1.7132562642642067e-06
    a3 = -3.660798456800642e-05
    a2 = 0.0005657675405418512
    a1 = -0.006417706671962786
    a0 = 0.05374303639750996
    y = a8*R**8 + a7*R**7 + a6*R**6 + a5*R**5 + a4*R**4 + a3*R**3 + a2*R**2 + a1*R + a0
    return y
x = np.linspace(2.5,22,num = 40)
x = list(x)
y = [PolynomialFunc(item) for item in x ]
plt.plot(x,y)