ipython/ipython — pull request #4083 by takluyver (2013-08-21 17:51:41+00:00)
Title: Implement a better check for hidden values for %who etc.

From discussion in #4076, this uses a dictionary for hidden values instead of a set, and checks identity as well as name.

```
In [3]: e = 5

In [4]: f = 6

In [5]: %who
e	f

In [6]: %whos
Variable Type Data/Info
----------------------------
e int 5
f int 6
```