TypeError：merge（）至少接受2个参数（给定4个）

import pandas as pd
import numpy as np

'''This is first dataframe'''

df1=pd.DataFrame({'fruit': ['apple', 'banana', 'orange']*3,'weight':['high','medium','low']*3 
                  ,'price': np.random.randint(0, 15, 9)})

'''This is first dataframe'''

df2=pd.DataFrame({'product': ['apple', 'orange', 'pine'] * 2,
                    'kilo': ['high', 'low'] * 3,
                    'price': np.random.randint(0, 15, 6)})

'''我要在两个数据帧上执行合并操作'''

merged=pd.merge(left_on=['fruit','weight'],right_on=['product','kilo'],how='inner',suffixes= 
                ['_left','_right'])

'''它给出了一个我不明白为什么的类型错误'''