import matplotlib.pyplot as plt
import numpy as np
import scipy.stats as st
import arviz as az
plt.style.use('arviz-darkgrid')
x = np.linspace(-4, 4, 200)
for alpha in [-6, 0, 6]:
    pdf = st.skewnorm.pdf(x, alpha, loc=0, scale=1)
    plt.plot(x, pdf, label=r'$\mu$ = {}, $\sigma$ = {}, $\alpha$ = {}'.format(0, 1, alpha))
plt.xlabel('x', fontsize=12)
plt.ylabel('f(x)', fontsize=12)
plt.legend(loc=1)
plt.show()