For now there are many usefull builtin functions like "any", "all", etc. I'd like to propose a new builtin function "equal". It should accept iterable, and return True if all items in iterable are the same or iterable is emty.
That's quite popular problem, there is a discussion of how to perform it on stackoverflow (http://stackoverflow.com/questions/3844801/check-if-all-elements-in-a-list-are-identical) - all suggestions are either slow or not very elegant.
What do you think about it?