s.union(r)
is a new set with elements from both s
and r
.reference You need to change
s.union(r)
to
s = s.union(r)
or, use set.update
.
s.union(r)
is a new set with elements from both s
and r
.reference You need to change
s.union(r)
to
s = s.union(r)
or, use set.update
.