Consider using parenthesis to avoid backslash line continuation in  examples

I'm guessing one of your design goals is beauty and readability. Would it create a nicer first impression to see:

```
result = (seq(1, 2, 3, 4)
        .map(lambda x: x * 2)
        .filter(lambda x: x > 4)
        .reduce(lambda x, y: x + y)
)
```

I understand that this is a personal preference so feel free to disagree :)
