#範例3-3：繪出紅色虛線，線寬4(x,y)圖
import pandas as pd
listx = [1,3,4,6,8,11,13,15,17]
listy = [20,45,30,42,50,60,90,80,100]
df = pd.DataFrame(listy,listx)
df.plot(kind='line',title='red dash line',legend=False,color='red',linestyle='--',linewidth=4)