例11-5 绘制沪指综合指数收盘数据趋势图 import matplotlib.pyplot as plt import numpy as np plt.rcParams['font.sans-serif'] = 'SimHei' plt.rcParams['axes.unicode_minus'] = False x = np.arange(0,2*np.pi,0.1) y = np.sin(x) f = plt.figure(figsize=(8,4),dpi=80) f.set_facecolor((0.92,0.92,0.96)) plt.title('正弦、余弦函数图形',fontsize=12) plt.xlabel('x 变量',fontsize=12) plt.ylabel('y 变量',fontsize=12) plt.xlim((0,6.6)) plt.ylim((-1,1)) plt.xticks(np.arange(0,6.6,0.4)) plt.yticks(np.arange(-1,1,0.2)) plt.plot(x,y,marker='o',linestyle='-',linewidth=1.2) y = np.cos(x) plt.plot(x,y,color='r',marker=',',linestyle='-',linewidth=1.2) plt.legend(['y=sin(x)','y=cos(x)'],fontsize=12) plt.text(3.2,np.sin(3.2)+0.08,'y = sin(3.2)',fontsize=12) plt.show()