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Returns a tuple whose items are the same and in the same order as sequence’s items. The sequence argument may be a sequence, a container that supports iteration, or an iterator object. If sequence is already a tuple, it is returned unchanged. For instance, tuple('abc') returns ('a', 'b', 'c') and tuple([1, 2, 3]) returns (1, 2, 3). If no argument is given, returns a new empty tuple, ().