NameError: name '__file__' is not defined

`foo.py`:

``` python
print(__file__)
```

```
$ bpython foo.py
Traceback (most recent call last):
  File "foo.py", line 1, in <module>
    print(__file__)
NameError: name '__file__' is not defined
```

---
- Bitbucket: https://bitbucket.org/bobf/bpython/issue/284
- Originally Reported By: [Steven Myint](http://bitbucket.org/myint)
- Originally Created At: 2014-05-11T19:50:46.295
