python 人民币 美元双向换算

你可以使用外汇牌价来进行人民币和美元的双向换算。以下是一个简单的示例代码：

import requests

def convert_currency(amount, from_currency, to_currency):
    # 获取实时汇率
    url = f"https://api.exchangerate-api.com/v4/latest/{from_currency}"
    response = requests.get(url)
    data = response.json()
    exchange_rate = data["rates"][to_currency]

    # 进行换算
    result = amount * exchange_rate
    return result

# 示例：将100人民币换算成美元
amount_rmb = 100
from_currency = "CNY"
to_currency = "USD"
result_usd = convert_currency(amount_rmb, from_currency, to_currency)
print(f"{amount_rmb} {from_currency} = {result_usd} {to_currency}")

# 示例：将100美元换算成人民币
amount_usd = 100
from_currency = "USD"
to_currency = "CNY"
result_cny = convert_currency(amount_usd, from_currency, to_currency)
print(f"{amount_usd} {from_currency} = {result_cny} {to_currency}")

注意：这只是一个简单示例，实际应用中可能需要考虑更多因素，如手续费、汇率波动等。另外，使用外部API获取汇率需要联网，请确保你的网络连接正常。