""" Miscellaneous utilities. """ def unique(g): """ Yield values yielded by ``g``, removing any duplicates. Example ------- >>> list(unique(iter([1, 3, 1, 2, 3]))) [1, 3, 2] """ yielded = set() for value in g: if value not in yielded: yield value yielded.add(value) def is_a(t): """ Partially-applied, flipped isinstance. >>> is_a(int)(5) True >>> is_a(str)(5) False """ return lambda v: isinstance(v, t)