货币转换的源代码

以下是Python语言实现的货币转换代码：

import requests

def convert_currency(amount, from_currency, to_currency):
    api_key = 'YOUR_API_KEY_HERE'  # 在 https://www.currencyconverterapi.com/ 注册并获取 API key
    url = 'https://free.currconv.com/api/v7/convert?q={}_{}&compact=ultra&apiKey={}'.format(from_currency, to_currency, api_key)
    response = requests.get(url)
    exchange_rate = response.json()['{}_{}'.format(from_currency, to_currency)]
    converted_amount = amount * exchange_rate
    return converted_amount

# 调用函数并输出结果
amount = 100
from_currency = 'USD'
to_currency = 'CNY'
converted_amount = convert_currency(amount, from_currency, to_currency)
print('{} {} = {} {}'.format(amount, from_currency, converted_amount, to_currency))

这个代码使用了 Currency Converter API 来获取汇率数据。请注意，你需要在该网站上注册并获取 API key，以便在代码中使用