import numpy.random as npr
import matplotlib.pyplot as plt
size = 1000
x_normal = npr.normal(loc = 0.8,scale = 1.5,size = (size,2))
plt.figure(figsize=(8,8))
plt.subplot(2,1,1)
plt.hist(x_normal,label=[u'正态抽样分布1',u'正态抽样分布2'],bins =30, stacked=True,edgecolor = 'k',alpha=0.5)#alpha透明度
plt.legend(fontsize = 8,loc=0)
plt.grid()
这里是默认的颜色,如果我想要切换颜色,facecolor = ['c','g']就报错了,咋办