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I'm trying to find a Python built-in that will return the first item i in a sequence that given a function f returns i when f(i) == True. I need this about every 300 lines of code or so (that's actually quite a bit of code in Python). The general use-case is running through a list looking for an item matching some criteria and then returning it. This is more commonly dictionary-land (i.e. the items should be stored in a dict keyed by the criteria instead of a list) but that's not always practical/needed.