如何将数据点拟合到Python中的函数e**x？

import numpy as np
from scipy.optimize import curve_fit
import matplotlib.pyplot as plt

def func(x, a, b):
    return np.exp(a * x + b)

x_data = np.array([1, 2, 3, 4, 5])
y_data = np.array([2.718, 7.389, 20.086, 54.598, 148.413])

params, params_covariance = curve_fit(func, x_data, y_data)

x = np.linspace(0, 6, 100)
y = func(x, params[0], params[1])

plt.plot(x_data, y_data, 'ro', label='Data')
plt.plot(x, y, label='Fitted curve')
plt.legend()
plt.show()