问如何用Python定义我自己的连续小波？

EN

import math
import numpy as np
from scipy import signal
import matplotlib.pyplot as plt

mother_wavelet = lambda z : np.exp(-z*z/4)*(2-z*z)/(4*math.sqrt(math.pi))

def mexican_hat_like(n,scale):
    x = np.linspace(-n/2,n/2,n)
    return mother_wavelet(x/scale)

points = 100
a = 4.0
vec_ours = mexican_hat_like(points, a)
vec_theirs = signal.ricker(points, a*math.sqrt(2))
plt.plot(vec_ours, label = 'ours')
plt.plot(vec_theirs, label = 'ricker')
plt.legend(loc = 'best')
plt.show()