Encapsulation unpythonic?

[Marco Buttu]

On 08/31/2013 08:07 AM, Fabrice Pombet wrote:

> well, look at that:
>
> a=(1,2)
> a=2+3 ->a is an object and I have changed its type and value from outside.

No, `a` is not an object, so you did not change the type of any object. 
`a` is just a name (a label), that initially refers to the tuple (1, 2):

 >>> a = (1, 2)
 >>> id(a)
140377464514968

ad after, to another object, of type int:

 >>> a = 2 + 3
 >>> id(a)
8752608

The bytecode:

 >>> dis.dis('a = (1, 2); a = 2 + 3;')
   1           0 LOAD_CONST               4 ((1, 2))
               3 STORE_NAME               0 (a)
               6 LOAD_CONST               5 (5)
               9 STORE_NAME               0 (a)
              12 LOAD_CONST               3 (None)
              15 RETURN_VALUE

Regards, M.

-- 
Marco Buttu