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[README.md] Add long lines policy to coding conventions

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@ -1192,6 +1192,25 @@ ##### Example
webpage, 'title', group='title') webpage, 'title', group='title')
``` ```
### Long lines policy
There is a soft limit to keep lines of code under 80 characters long. This means it should be respected if possible and if it does not make readability and code maintenance worse.
For example, you should **never** split long string literals like URLs or some other often copied entities over multiple lines to fit this limit:
Correct:
```python
'https://www.youtube.com/watch?v=FqZTN594JQw&list=PLMYEtVRpaqY00V9W81Cwmzp6N6vZqfUKD4'
```
Incorrect:
```python
'https://www.youtube.com/watch?v=FqZTN594JQw&list='
'PLMYEtVRpaqY00V9W81Cwmzp6N6vZqfUKD4'
```
### Use safe conversion functions ### Use safe conversion functions
Wrap all extracted numeric data into safe functions from [`youtube_dl/utils.py`](https://github.com/rg3/youtube-dl/blob/master/youtube_dl/utils.py): `int_or_none`, `float_or_none`. Use them for string to number conversions as well. Wrap all extracted numeric data into safe functions from [`youtube_dl/utils.py`](https://github.com/rg3/youtube-dl/blob/master/youtube_dl/utils.py): `int_or_none`, `float_or_none`. Use them for string to number conversions as well.