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代码实现人民币和美元的相互换算

import requests from lxml import etree from time import sleep class trans_rate: def __init__(self): self.headers = { 'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36', 'referer': 'https://pos.baidu.com/' } def parse(self,parse_url): response = requests.get(parse_url,headers=self.headers) result = etree.HTML(response.text).xpath('//td/p/text()')[-1] # print(result) return result def quit(self): if input("输入1重新换算，或者点击回车键用以退出").strip()== '1': print('\n'*2) return self.run() else: pass def get_url(self): input1 = input("输入你要选择的兑换的汇率对象(默认为人民币换算成美元)：" + "\n" + "\t" + " 输入1选择美元换算至人民币，\n\t 其余任意值为人民币换算至美元!\n") money = input("输入需要换算的金额：").strip() if input1 == '1': url = "https://qq.ip138.com/hl.asp?from=USD&to=CNY&q={}".format(money) print("当前为美元换算成人民币：") else: url = "https://qq.ip138.com/hl.asp?from=CNY&to=USD&q={}".format(money) print("当前为人民币换算成美元：") return url def current_rate(self): res1 = requests.get("https://qq.ip138.com/hl.asp?from=USD&to=CNY&q=1", headers=self.headers).text a = etree.HTML(res1).xpath("//td[2]/p/text()")[1] print("当前美元对人民币的汇率为：1美元 = " + a + "元人民币") def run(self): self.current_rate() url =self.get_url() res = self.parse(url) print(res) # sleep(2) print('\n') self.quit() if __name__ == '__main__': tr = trans_rate() tr.run()