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Python FrozenSet Methods

method	description
union	all elements from both sets
intersection	elements exists in both sets
difference	set1-set2, i.e elements from set1, which are not in set2
symetric_difference
issubset	returns True, when set1 elements contained in set2
issuperset	returns True when set2 all elements are contained in set2
isdisjoint
copy	does shallow-copy

Set Remove and discard methods

    Both methods are used to remove a element from the Set object.
discard method removes element if found, otherwise do nothing
remove methood also removes element if found, otherwise KeyError exception thrown