docs(python): add docs about threading (#8829)

Co-authored-by: Max Schmitt <max@schmitt.mx>
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Kumar Aditya 2021-09-27 15:52:16 +05:30 committed by GitHub
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@ -189,6 +189,11 @@ Playwright runs the driver in a subprocess, so it requires `ProactorEventLoop` o
On Windows Python 3.7, Playwright sets the default event loop to `ProactorEventLoop` as it is default on Python 3.8+.
### Threading
Playwright's API is not thread-safe. If you are using Playwright in a multi-threaded environment, you should create a playwright instance per thread. See [threading issue](https://github.com/microsoft/playwright-python/issues/623) for more details.
## System requirements
Playwright requires Python 3.7 or above. The browser binaries for Chromium,