How to use 'a set can be appended to a set.' in Python

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1597def set_append(input_set, item):
1598 # type: (set, Any) -> set
1599 """
1600 Appends in-place the given item to the set.
1601 If the item is a list, all elements are added to the set.
1603 :param input_set: An existing set
1604 :param item: The item or list of items to add
1605 :return: The given set
1606 """
1607 if item:
1608 if isinstance(item, (list, tuple)):
1609 input_set.update(item)
1610 else:
1611 input_set.add(item)
1612 return input_set

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