It's also recommended to write

```
foo = (
    "looooooooooooooooong string 1"
    "looooooooooooooooong string 2"
    ...
)
```
instead of
```
foo = \
    "looooooooooooooooong string 1" + \
    "looooooooooooooooong string 2" + \
    ...
```
http://www.python.org/dev/peps/pep-0008/#maximum-line-length