[mbreese]

A function may have the perfect name at the time you wrote it. It may make perfect sense within the context that you initially conceived of it. However, after some time away from it, when you're trying to mentally rebuild that context, it may make as much sense as def foo().

Good naming is important, but you also have to know the context, which is more difficult to remember.

[ryanpetrich]

If it only makes sense within the context it was conceived under, that's not a perfect name. A function name should make sense for someone with understanding of the domain, but no understanding of the code. When that's not possible, comments definitely help.