初始化Sync的playwright的实例

Playwright的代码，初始化Playwright实例：

之前的常见的with写法是

from playwright.sync_api import sync_playwright

with sync_playwright() as p:
    for browser_type in [p.chromium, p.firefox, p.webkit]:
        browser = browser_type.launch()
        ...

此处希望初始化一个全局的playwright的实例，供后续使用。

所以就去掉with，改为普通赋值：

    p = sync_playwright()

报错：

错误原因：不是很懂。

解决办法：找到了规避的办法：

参考官网和别人例子，加上.start()：

p = sync_playwright().start()

即可。