Python Style Guide: Mention YAPF

[Andrew Grieve]

https://chromium-review.googlesource.com/c/chromium/src/+/1352819

Propose adding:

 * Directories need to opt into pylint presumbit checks via:
   `input_api.canned_checks.RunPylint()`.
### YAPF
[YAPF](https://github.com/google/yapf) is a Python formatter that can be used via:
```sh
git cl format --python
```
Directories can opt into enforcing YAPF styling by adding `.style.yapf` file
with the following contents:
```
[style]
based_on_style = chromium
```
Entire files can be formatted (rather than just touched lines) via:
```sh
git cl format --python --full
```

[Peter Wen]

Looks good to me.

To clarify, without a .style.yapf file anywhere, what style does `git cl format --python` use?

Peter

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[Andrew Grieve]

It uses the .style.yapf from depot_tools.