pandas读csv文件，任意两列线图

import pandas as pd
import matplotlib.pyplot as plt
datt=pd.read_csv('data_test1.csv',usecols=[1,2],index_col=[0])
print(datt)
plt.plot(datt)

其中csv文件为

date,    items,    price
4,        5,       32
5,        10,       78
6,        15,        88