python实现excel lookup功能

import pandas as pd 
sx_customer_0409=pd.read_excel(r'E:\lusiru\202004\20200402随心降额名单筛选\sx_customer_0409.xlsx')#读取原始数据
fx_variable=pd.read_excel(r'E:\lusiru\202004\20200402随心降额名单筛选\fx_variable.xlsx')#读取分箱列表数据

def lookup(lookup_value,lookup_vector,return_ve