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商品降价了?Python 第一时间通知你

  • 2026-08-31 01:54:53
商品降价了?Python 第一时间通知你

你是不是也这样蹲过降价

双十一、618、品牌日,心里那个想买的东西价格忽上忽下。你是不是也干过这种事:把商品页加进收藏,每天点开七八回,就为了看它降没降。盯着屏幕眼睛酸,还经常错过最低点——等你刷到的时候,券已经抢光了。其实这种"反复刷新、人工比对"的活儿,最该交给电脑。今天我们就用 Python 写一个"价格哨兵":你只管把商品链接丢给它,一旦降价,它第一时间通知你。

这事儿,本质上就是 RPA 加上监控

说直白点,我们要干的活分三步:打开网页、读价格、比一比。第一步"打开网页读内容",正是 RPA(机器人流程自动化)最拿手的浏览器自动化;后面"定时检查 + 降价就报警",又是自动化运维里监控告警的思路。两个方向一结合,你就拥有了一个 24 小时不睡觉的盯价小助手。它不抢券、不下单,只负责"盯"和"喊你",安全又省心。

先准备两件小工具

只要装好一个库就能跑,不用会前端。第一件是 Playwright,专门用来让 Python 控制真实浏览器:

pip install playwright

playwright install chromium

第二件,是找到商品页"价格"长在哪。在浏览器里打开商品页,把鼠标移到价格数字上,右键选"检查",你会看到类似 <span class="price">¥219.00</span> 这样的代码。记下那个 class 名(这里是 price),待会告诉程序去哪抓数字就行。

核心代码:先盯一个商品

下面这段就是哨兵的"眼睛"。它打开网页,等价格出现,把文字读出来,再用正则抠出数字。

import json, re, os

from playwright.sync_api import sync_playwright

def extract_price(text):

    # 从 "¥219.00" 这类文字里抠出数字

    m = re.search(r"(\d+\.?\d*)", text)

    return float(m.group(1)) if m else None

def check_price(url, selector):

    with sync_playwright() as pw:

        browser = pw.chromium.launch(headless=True)

        page = browser.new_page()

        page.goto(url, timeout=30000)

        page.wait_for_selector(selector, timeout=10000)

        text = page.locator(selector).inner_text()

        browser.close()

    return extract_price(text)

price = check_price(

    "https://example.com/product/123",

    ".price",

)

print("当前价格:", price)

headless=True 表示浏览器在后台偷偷跑,不弹窗;wait_for_selector 会等价格元素加载好再读,避免抢到空值。第一次跑如果报缺浏览器,回头确认 playwright install chromium 执行过了。

一次盯一堆,还能记住上次的价

一个商品不过瘾?把要盯的都写进一个列表,循环检查,再用一个 JSON 文件记住"上次价格",这样才知道到底是涨是跌。

import json, os

WATCH_FILE = "prices.json"

PRODUCTS = [

    {"name": "无线耳机", "url": "https://example.com/p/1", "selector": ".price", "target": 199.0},

    {"name": "机械键盘", "url": "https://example.com/p/2", "selector": ".price", "target": 359.0},

]

def load_history():

    if os.path.exists(WATCH_FILE):

        return json.load(open(WATCH_FILE, encoding="utf-8"))

    return {}

def save_history(data):

    json.dump(data, open(WATCH_FILE, "w", encoding="utf-8"),

              ensure_ascii=False, indent=2)

history = load_history()

for p in PRODUCTS:

    now = check_price(p["url"], p["selector"])

    old = history.get(p["name"])

    history[p["name"]] = now

    if old is None:

        print(p["name"], "已记录价格", now)

    elif now < old:

        print("降价啦!", p["name"], "从", old, "降到", now)

    elif now < p["target"]:

        print("到心理价位了:", p["name"], now, "(目标", p["target"], ")")

    else:

        print(p["name"], "还是", now, ",继续等")

save_history(history)

target 是你心里的"便宜线",低于它就算捡到。下次再跑,程序会拿新价和文件里存的老价比,涨跌一眼看出。

降价了,怎么让你知道

光打印在屏幕上可不行,你总不能一直盯着终端。最简单的是接一个企业微信/钉钉群机器人,降价时直接推消息到手机。

import requests

def notify(msg):

    webhook = "https://qyapi.weixin.qq.com/cgi-bin/webhook/send?key=你的KEY"

    requests.post(webhook, json={"msgtype": "text", "text": {"content": msg}})

# 在"降价啦"那个分支里加一句:

# notify(f"{p['name']} 降价了!现在 {now} 元")

把 你的KEY 换成群里机器人给你的地址即可。不想折腾群机器人,也可以改成发邮件(用我们之前讲过的 smtplib),或者先偷懒——把消息写进一个 alerts.txt 文件,睡前瞄一眼也行。

让它每天自动跑,不用你动手

盯着终端跑一次不算完,真正的"哨兵"得自己定时巡逻。装个小库 schedule,让它每天早上九点自动查一轮。

import schedule, time

def patrol():

    # 把上面"一次盯一堆"的代码整个塞进这个函数

    print("巡逻开始……")

schedule.every().day.at("09:00").do(patrol)

while True:

    schedule.run_pending()

    time.sleep(60)

time.sleep(60) 是让程序每 60 秒看一眼"到点没",轻量不占资源。想更稳,也可以把它丢进服务器的定时任务里常驻。咱之前聊过的 cron、Docker,这时候就能派上用场了。

新手容易踩的几个坑

- 选择器失效:页面改版后 class 名可能变,报错就回去重新"检查"抄一个新的。

- 价格带逗号或"券后":正则只抓第一串数字,遇到"¥1,299"会拿到 1,记得先清掉逗号,或换更准的提取规则。

- 网站反爬:频繁访问可能被拦,加 time.sleep(3) 放慢节奏,别把人家服务器搞崩。

- 后台浏览器报错:确认 playwright install chromium 装好了,公司电脑若有代理也可能连不上。

小结

你看,一个"盯价助手"其实就是打开网页、读数字、比大小、再喊你一声——每一步都不难,拼起来却真能省下不少冤枉钱。RPA 把"人工刷新"变成"机器巡逻",监控告警思想让它在关键时刻提醒你,这正是自动化最迷人的地方。先从一个商品试起,跑通了再慢慢加。你最想用这个小哨兵盯哪样东西?评论区告诉我,下期挑一个真实链接带大家手把手跑一遍。

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  1. CONNECT:[ UseTime:0.000929s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001449s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000685s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000678s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001366s ]
  6. SELECT * FROM `set` [ RunTime:0.000633s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001418s ]
  8. SELECT * FROM `article` WHERE `id` = 512353 LIMIT 1 [ RunTime:0.001033s ]
  9. UPDATE `article` SET `lasttime` = 1788125098 WHERE `id` = 512353 [ RunTime:0.019279s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000637s ]
  11. SELECT * FROM `article` WHERE `id` < 512353 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001112s ]
  12. SELECT * FROM `article` WHERE `id` > 512353 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001174s ]
  13. SELECT * FROM `article` WHERE `id` < 512353 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001847s ]
  14. SELECT * FROM `article` WHERE `id` < 512353 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004257s ]
  15. SELECT * FROM `article` WHERE `id` < 512353 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.024962s ]
0.254375s