问题已经解决，谢谢谢谢谢谢谢谢！

问题已经解决，谢谢！

def make_prob_plot():
	sizes =  [10, 100, 1000, 5000]
	for sample_size in sizes:
		t_dist, x_axis = make_t_distribution(sample_size, 0, 2)
		plt.plot(x_axis,t_dist.pdf(x_axis))
		plt.plot(x_axis,stats.norm.pdf(x_axis,0,2),'-')
	lengends = []
	for x in sizes:
		lengends.append('t_dist:{0}'.format(x))
		lengends.append('norm:{0}'.format(x))

	plt.legend(lengends)
	plt.show()
	return None