Sort dict with key of user class

[methane (Inada Naoki)]

I think it is duplicate of this discussion:

Adding sortedcontainers package into the standard library?

Hi, from what I can see Python is one of the few major languages that lacks a collection of sorted containers in the standard library, I am just wondering if there are any obstacles that I am not seeing to get this very nice package into the standard library: Please let me know your thoughts!