大家都知道playwright代码的标准写法是：

with sync_playwright() as p:

    browser = p.chromium.launch(channel="chrome", headless=False)
    page = browser.new_page()
    page.goto("http://www.baidu.com")
    print(page.title())
    browser.close()

with sync_playwright() as 是python中的重要知识点上下文管理器(context manager)。上下文管理器用于规定某个对象的使用范围。一旦进入或者离开该使用范围，会有特殊操作被调用,它的语法形式就是with...as...

详情可以参考文章

以playwright脚本为例，详解Python with as处理异常的原理-CSDN博客

我们一定要用上下文管理器这种形式编写代码吗？当然不是！我们也可以这样设计代码：

playwright2 = sync_playwright().start() #用这句开头
print(type(playwright2)) #输出<class 'playwright.sync_api._generated.Playwright'>
browser2= playwright2.chromium.launch(headless=False)
page2 = browser2.new_page()
page2.goto("http://www.baidu.com")
print(page2.title())
browser2.close()
playwright2.stop()  #用这句结尾

可能有的人要问我是怎么知道这种写法的呢？我是在看playwright源码时无意间看到的，哈哈！

源码位置 \playwright\sync_api\_generated.py文件中的 class Playwright(SyncBase)的stop方法

def stop(self) -> None:
    """Playwright.stop

    Terminates this instance of Playwright in case it was created bypassing the Python context manager. This is useful
    in REPL applications.

    ```py
    >>> from playwright.sync_api import sync_playwright

    >>> playwright = sync_playwright().start()

    >>> browser = playwright.chromium.launch()
    >>> page = browser.new_page()
    >>> page.goto(\"http://whatsmyuseragent.org/\")
    >>> page.screenshot(path=\"example.png\")
    >>> browser.close()

    >>> playwright.stop()
    ```
    """

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