from matplotlib.font_manager import FontProperties
plt.xlabel('花瓣的长度', fontproperties=font_set)
plt.ylabel('花茎的长度', fontproperties=font_set)

from matplotlib.pylab import mpl

mpl.rcParams['font.sans-serif'] = ['SimHei']

plt.scatter(x[:50,0],x[:50,1],color='red',marker='o',label='setosa');

plt.scatter(x[50:100,0],x[50:100,1],color='blue',marker='x',label='versicolor');

plt.xlabel('花径长度')

plt.ylabel('花瓣的长度')

plt.legend(loc = 'upper left');