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Encourage new style string formatting (#87)

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Ville Skyttä 2018-09-15 10:07:13 +03:00 committed by GitHub
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docs/development_guidelines.md
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@ -81,3 +81,12 @@ Instead of order the imports manually, use [`isort`](https://github.com/timothyc
$ pip3 install isort
$ isort homeassistant/components/sensor/fixer.py
```
### Use new style string formatting
Prefer [new style string formatting](https://www.python.org/dev/peps/pep-3101/) over old.
```python
"{} {}".format('New', 'style')
"%s %s" % ('Old', 'style')
```