Python

a = {1, 2, 3, 4, 5, 6}
len(a)

n = len({1, 2, 3})
# n = 3
or 
myset = set()
myset.add(1) 
myset.add(2) 
myset.add(3) 
len(set1)
# len(set1) = 3

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