汇率转换小程序

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利用爬虫爬取一个网址里面的汇率值，实现汇率转换小程序。
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import requests
from lxml import etree

headers = {
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.89 Safari/537.36"
}
url = "https://www.huilv.cc/USD_CNY/"

def Get_huilv(url, headers1, currency_str_value):
    res = requests.get(url=url, headers=headers1, timeout=2)
    # print(res.status_code)  # 打印状态码
    html = etree.HTML(res.text)
    USD_VS_RMB_0 = html.xpath('//div[@id="main"]/div[1]/div[2]/span[1]/text()')
    for a in USD_VS_RMB_0:
        b = a
    USD_VS_RMB_1 = float(b)
    print("实时汇率为：{}".format(USD_VS_RMB_1))
    USD_VS_RMB = float(str(USD_VS_RMB_1))
    
    # 获取货币单位
    unit = currency_str_value[-3:].upper()  # 第一次判断
    if unit == 'CNY':
        exchange_rate = 1 / USD_VS_RMB
        string = "美元"
    elif unit == 'USD':
        exchange_rate = USD_VS_RMB
        string = "元"
    else:
        exchange_rate = -1
    if exchange_rate != -1:
        in_money = eval(currency_str_value[0:-3])
        # 使用lambda定义函数
        convert_currency2 = lambda x: x * exchange_rate
        # 调用lambda函数
        out_money = convert_currency2(in_money)
        print('转换后的金额是：{} {} '.format(out_money, string))
    else:
        print('无法计算')

Get_huilv(url, headers, '100 CNY')