Help me understand this

[Beej]

On Jan 29, 11:47 pm, Steven D'Aprano 
<s... at REMOVEME.cybersource.com.au> wrote:
> Outside of a print statement (and also an "except" statement), commas
> create tuples.

And function calls:

>>> 3,
(3,)
>>> type(3,)
<type 'int'>
>>> type((3,))
<type 'tuple'>

But here's one I still don't get:

>>> type(2)
<type 'int'>
>>> type((2))
<type 'int'>
>>> (2).__add__(1)
3
>>> 2.__add__(1)
  File "<stdin>", line 1
    2.__add__(1)
            ^
SyntaxError: invalid syntax

-Beej