智能识别哪里便宜

import requests
from bs4 import BeautifulSoup

def fetch_price(url):
    response = requests.get(url)
    soup = BeautifulSoup(response.text, 'html.parser')
    price_tag = soup.find('span', class_='price')
    if price_tag:
        return float(price_tag.text.replace('$', '').strip())
    return None

def compare_prices(urls):
    prices = {}
    for name, url in urls.items():
        price = fetch_price(url)
        if price is not None:
            prices[name] = price
    return prices

# 示例使用
product_urls = {
    'Amazon': 'https://www.amazon.com/dp/B08N5LNQCX',
    'BestBuy': 'https://www.bestbuy.com/site/...', 
    # 添加更多网站URL
}

prices = compare_prices(product_urls)
cheapest_store = min(prices, key=prices.get)
print(f"The cheapest price is at {cheapest_store}: ${prices[cheapest_store]}")