python怎么运行js文件？

import execjs 

#执行本地的js   

def get_js(): 

    # f = open("D:/WorkSpace/MyWorkSpace/jsdemo/js/des_rsa.js",'r',encoding='UTF-8') 

    f = open("./js/des_rsa.js", 'r', encoding='UTF-8') 

    line = f.readline() 

    htmlstr = '' 

    while line: 

        htmlstr = htmlstr + line 

        line = f.readline() 

    return htmlstr 

jsstr = get_js() 

ctx = execjs.compile(jsstr) 

print(ctx.call('enString','123456'))

function enString(data){ 

var key1 = "YHXWWLKJYXGS"; 

var key2 = "ZFCHHYXFL10C"; 

var key3 = "DES"; 

 var enchex = strEnc(data,key1,key2,key3); 

 return enchex; 

}