( a, b ) foo.bar( a, b ) foo = [ 1, 2, 3 ] foo = { "a": 1, "b": 2, "c": 3 } foo = { 1, 2, 3, } foo = ( 1 + 2 ) ( a for a in range(0, 10) ) foo = [ a for a in range(0, 10) ] foo = { a for a in range(0, 10) } foo = { a: b for a, b in items } foo.bar( "baz") [ a + b for ( a, b ) in items ] [ a + b for [ a, b ] in items ]