Set is a very useful and interesting datatype, can not change value after creation, is mutable, unordered and most importantly not support duplicate values.
val = {'a','b','c'}
print(type(val))
val.add('d')
print(val)
try:
val[1] = 'e'
except:
print('Can not update value in set')
val1 = set([1,2,3,4])
val2 = set([4,5,6,7])
print(val1)
print(val2)
val3 = val1.union(val2)
print(val3)
val3 = {1,2,3,4}
val4 = {4,5,6,7}
val5 = val3.union(val4)
print(val5)Output:
<class 'set'>
{'b', 'a', 'c', 'd'}
Can not update value in set
{1, 2, 3, 4}
{4, 5, 6, 7}
{1, 2, 3, 4, 5, 6, 7}
{1, 2, 3, 4, 5, 6, 7}