list Integer indexing dies??

[Ishwor]

On Thu, 23 Dec 2004 11:17:57 -0300, Batista, Facundo
<FBatista at unifon.com.ar> wrote:
> 
[snip]

> #- >>> 1[0] 
> #- 
> #- Traceback (most recent call last): 
> #-   File "<pyshell#246>", line 1, in -toplevel- 
> #-     1[0] 
> #- TypeError: unsubscriptable object 
> #- >>> 
> 
> Well, because the integer is not a subscriptable object.... 
> 
If i see this code 'a'[0] then what does it really say about semantics
?? Really its hard for me to digest that 'a'[0] is supported by Python
where as 1[0] isn't.
look at this
>>> 'invalid'[0]
'i'
>>> 123232[-1] 
# Python should automagically infer here that user
# means indexing and *not* the number per se. 
# (i mean list in context of the line :-) )

Traceback (most recent call last):
  File "<pyshell#284>", line 1, in -toplevel-
    123232[-1]
TypeError: unsubscriptable object


> IOW, the string is a sequence of characters, and the integer is not sequence
> at all. 
> 

strings are immutable sequence of collections in Python. Integers are
numbers. ;-)

> >>> 'a'[0] 
> 'a' 
> >>> 'ab'[0] 
> 'a' 
> >>> 'ab'[1] 
> 'b' 
> 
> What behaviour did you expect when subscripting an integer? 
>

I got unscriptable object TypeError (extract below) which is *now*
with your enlightment clear to me ;-)

>>> 1[0]

Traceback (most recent call last):
 File "<pyshell#246>", line 1, in -toplevel-
   1[0]
TypeError: unsubscriptable object
>>>


 
> .    Facundo 
> 
> Bitácora De Vuelo: http://www.taniquetil.com.ar/plog 
> PyAr - Python Argentina: http://pyar.decode.com.ar/ 
> 

[snip]

Thanks Batista.

-- 
cheers,
Ishwor Gurung