On Sun, Nov 10, 2013 at 09:34:56AM -0800, Aaron Meurer wrote:
>    Is this the right behavior if it returns None?

From the docs:
```
In [3]: bool?
Type:       type
String Form:<type 'bool'>
Namespace:  Python builtin
Docstring:
bool(x) -> bool

Returns True when the argument x is true, False otherwise.
The builtins True and False are the only two instances of the class bool.
The class bool is a subclass of the class int, and cannot be subclassed.
```