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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