#在图形中添加指示
import matplotlib.pyplot as plt
import numpy as np
x=np.linspace(0.05,10,1000)
y=np.sin(x)
plt.plot(x,y,label="plot figure",ls=":",c="red",lw=2)
plt.legend()
#xy被注释图形内容位置坐标，xytext注释文本的位置坐标，color注释文本的颜色。arrowprops指示被注释内容的箭头的属性字典
plt.annotate("maxmin",xy=(np.pi/2,1.0),xytext=((np.pi/2)+1,0.8),color="blue",weight="bold",
arrowprops=dict(arrowstyle="->",connectionstyle="arc3",color="b"))
#添加无指示标记文本注释
plt.text(4.10,0.09,"y=sin(x)",weight="bold",color="green")
plt.xlabel("x-axis",fontsize=15)
plt.ylabel("y-axis",fontsize=15)
plt.title("y=sin(x)",fontsize=15)
plt.
plt.show()