l = [ 1, 2, 3 ] lc = [ x for x in range(42) if x ] s = { 1, 2, 3 } sc = { x for x in range(42) if x } t = ( 1, 2, 3 ) g = ( x for x in range(42) if x ) d = { 1: True, 2: False, 3: None } dc = { x: None for x in range(42) if x }