nums: n * n for n in [1, 2, 3] if n % 2 isnt 0.
results: n * 2 for n in nums.

# next: for n in [1, 2, 3] if n % 2 isnt 0
#   print('hi') if false
#   n * n * 2.

print(results.join(',') is '2,18')