How to join two sets in one line without using “|”

Question

Assume that S and T are assigned sets. Without using the join operator |, how can I find the union of the two sets? This, for example,

Answer 1

Assuming you also can't use s.union(t), which is equivalent to s | t, you could try

>>> from itertools import chain
>>> set(chain(s,t))
set([1, 2, 3, 4, 5, 6])

Or, if you want a comprehension,

>>> {i for j in (s,t) for i in j}
set([1, 2, 3, 4, 5, 6])