def plot_post(prior, like, post, x):
 maxy = max(max(prior), max(like), max(post))
 plt.figure(figsize=(12, 4))
 plt.plot(x, like, label='likelihood', linewidth=12, color='black', alpha=.2)
 plt.plot(x, prior, label='prior')
 plt.plot(x, post, label='posterior', color='green')
 plt.ylim(0, maxy)
 plt.xlim(0, 1)
 plt.title('Density of prior, likelihood and posterior')
 plt.xlabel('Parameter value')
 plt.ylabel('Density')
 plt.legend()

post = posterior(pp, l)
plot_post(pp, l, post, p)