set.union()
set.union() is a Python method in the Set Methods category. Returns a new set with elements from the set and all others (| operator). The syntax is set.union(*others). Parameters: *others — iterables. Returns: New set. A typical example: {1, 2}.union({2, 3}) # {1, 2, 3}
{1, 2} | {2, 3} | {3, 4} # {1, 2, 3, 4}. A close sibling is set.add(), which adds an element to the set if not already present. A close sibling is set.remove(), which removes element x; raises KeyError if not found. A close sibling is set.discard(), which removes element x if present (does nothing if not found). A close sibling is set.pop(), which removes and returns an arbitrary element. Raises KeyError if empty. More about this category: Set methods for collection operations — union, intersection, difference, and more. For a broader walkthrough, read the Set Methods guide.