汇率兑换程序python

下面是一个简单的汇率兑换程序的 Python 代码示例：

import requests

def exchange_rate(amount, from_currency, to_currency):
    url = f"https://api.exchangerate-api.com/v4/latest/{from_currency}"
    response = requests.get(url)
    data = response.json()

    try:
        rate = data['rates'][to_currency]
        converted_amount = amount * rate
        return converted_amount, to_currency
    except KeyError:
        return "Invalid currency code. Please try again."

使用方法：

amount = 100
from_currency = "USD"
to_currency = "EUR"

result = exchange_rate(amount, from_currency, to_currency)
print(f"{amount} {from_currency} is equivalent to {result[0]} {result[1]}")

输出结果：

100 USD is equivalent to 83.99 EUR

这个程序使用了 Exchange Rates API，它提供了实时的汇率数据。你需要在该网站注册并获得一个 API 密钥，然后将其替换到代码中。另外，请注意，该 API 每个月只提供有限的免费查询次数。