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Python Set Methods

method	description
clear	removes all elements
copy	does shallow-copy
add	Adds an element into the list.if element already exists do nothing
remove	removes element,otherwise keyError exction
pop	Removes arbitrary set element
update	set1.update(set2), All unique elements from both sets are updated in set1,set2 is unchanged. This is equal to add 2 sets
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
difference_update	Remove all elements from another set from this set
symetric_difference	Return set with uncommon elements from both sets
symetric_difference_update	same as Symmetric-difference, but removes LHS set elements, and updates with uncommon elements from both sets. RHS set unchanged
intersection_update	Same as intersetion, In intersection method returns a new set, but in this case updates set1(LHS) with intersected values, Set2(RHS) unchanged
issubset	returns True, when set1 elements contained in set2
issuperset	returns True when set2 all elements are contained in set2
discard	removes element from list

Set Remove and discard methods Difference

    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