Explain please

Question

x = {1:0,0:1}
y=[1,[4,6,5,4],2]
print(list(set(y[x[0]]))[0])

output - 5
how ?????...

Answer 1

When converting from array or list to a set, you can no longer trust the index operator ( [ ] ), because in a set there is no concept of first or last element; so a random value of the set is returned.

Answer 2

oke james but how