parenthesis around a tuple of literals in a for

[Skaperen]

is parenthesis required around a tuple of literals in a for?

i'm running into this:

Output:
>>> for x in 1,2,3:
...   print(x)
... 
1
2
3
>>> [x for x in 1,2,3]
  File "<stdin>", line 1
    [x for x in 1,2,3]
                 ^
SyntaxError: invalid syntax
>>>