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Aug 24, 2021
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docs(python): mention event loop compatibility #8403

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7 changes: 7 additions & 0 deletions docs/src/intro-python.md
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Expand Up @@ -182,6 +182,13 @@ It is recommended to only bundle the browsers you use.

You should use `page.wait_for_timeout(5000)` instead of `time.sleep(5)` and it is better to not wait for a timeout at all, but sometimes it is useful for debugging. In these cases, use our wait method instead of the `time` module. This is because we internally rely on asynchronous operations and when using `time.sleep(5)` they can't get processed correctly.


### incompatible with `SelectorEventLoop` of `asyncio` on Windows

Playwright runs the driver in a subprocess, so it requires `ProactorEventLoop` of `asyncio` on Windows because `SelectorEventLoop` does not supports async subprocesses.

On Windows Python 3.7, Playwright sets the default event loop to `ProactorEventLoop` as it is default on Python 3.8+.

## System requirements

Playwright requires Python 3.7 or above. The browser binaries for Chromium,
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