Earlier, you learned about set collections. In this section, you will learn the methods provided by set types one by one. First, you can see what methods it has with the dir (set) command:
dir(set)
The specific syntax structure and function of each method are shown in the following table.
| Method Name | Syntax Format | Features |
|---|---|---|
| add() | set1.add() | Add numbers, strings, tuples, or booleans to the set1 collection |
| clear() | set1.clear() | Clear all elements in set1 |
| copy() | set2 = set1.copy() | Copy set1 to set2 |
| difference() | set3 = set1.difference(set2) | Give set3 the elements in set1 but not in set2 |
| difference_update() | set1.difference_update(set2) | Remove the same elements from set1 as set2 |
| discard() | set1.discard(elem) | Remove the elem element in set1 |
| intersection() | set3 = set1.intersection(set2) | Take the intersection of set1 and set2 to set3 |
| intersection_update() | set1.intersection_update(set2) | Take the intersection of set1 and set2 and update to set1 |
| isdisjoint() | set1.isdisjoint(set2) | Determine if set1 and set2 have no intersection, return False if there is intersection; return True if there is no intersection |
| issubset() | set1.issubset(set2) | Determines whether set1 is a subset of set2 |
| issuperset() | set1.issuperset(set2) | Determine if set2 is a subset of set1 |
| pop() | a = set1.pop() | Take an element from set1 and assign it to a |
| remove() | set1.remove(elem) | Remove the element from set1 |
| symmetric_difference() | set3 = set1.symmetric_difference(set2) | Take different elements in set1 and set2 and give set3 |
| symmetric_difference_update() | set1.symmetric_difference_update(set2) | Take different elements from set1 and set2 and update to set1 |
| union() | set3 = set1.union(set2) | Take the union of set1 and set2 and assign to set3 |
| update() | set1.update(elem) | Add elements from a list or collection to set1 |
For example:
set1 = {1,2,3}
set1.add((1,2)) #add method
set1
set1 = {1,2,3}
set1.clear() #clear method
set1
The output is:
{(1, 2), 1, 2, 3}
set()
set1 = {1,2,3}
set2 = set1.copy() #copy method
set1.add(4)
set1
The output is:
{1, 2, 3, 4}
set1 = {1,2,3}
set2 = {3,4}
set3 = set1.difference(set2) #difference method
set3
The output is:
{1, 2}
set1 = {1,2,3}
set2 = {3,4}
set1.difference_update(set2) #difference_update method
set1
The output is:
{1, 2}
set1 = {1,2,3}
set1.discard(2) #discard method
set1
The output is:
{1, 3}
set1.discard(4) #discard method
set1 = {1,2,3}
set2 = {3,4}
set3 = set1.intersection(set2) #intersection method
set3
The output is:
{3}
set1 = {1,2,3}
set2 = {3,4}
set1.intersection_update(set2) #intersection_update method
set1
The output is:
{3}
set1 = {1,2,3}
set2 = {3,4}
set1.isdisjoint(set2) #isdisjoint method
The output is:
False
set1 = {1,2,3}
set2 = {1,2}
set1.issubset(set2) #issubset method
The output is:
False
set1 = {1,2,3}
set2 = {1,2}
set1.issuperset(set2) #issuperset method
The output is:
True
set1 = {1,2,3}
a = set1.pop() #pop method
set1
a
The output is:
{2, 3}
1
set1 = {1,2,3}
set1.remove(2) #remove method
set1
The output is:
{1, 3}
set1 = {1,2,3}
set2 = {3,4}
set3 = set1.symmetric_difference(set2) # symmetric_difference method
set3
The output is:
{1, 2, 4}
set1 = {1,2,3}
set2 = {3,4}
set3=set1.union(set2) #union method
set3
The output is:
{1, 2, 3, 4}
set1 = {1,2,3}
set1.update([3,4]) #update method
set1
The output is:
{1, 2, 3, 4}
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