list Integer indexing dies??

[Ishwor]

Hi all. Look at this snippet of code.

>>> l = ['a','b','c','d']
>>> l
['a', 'b', 'c', 'd']
>>> l[0][0][0]
'a'
It prints the value 'a'. Fine so far :-)
l[0] ---> 'a' . 
l[0][0]---> 'a'[0] --> 'a'.
l[0][0][0] ---> 'a'[0][0] --> 'a'[0] --> 'a'

Now why doesnt this list which holds integer seem to work??

>>> l = [1,2,3]
>>> l[0]
1
>>> l[0][0]

Traceback (most recent call last):
  File "<pyshell#244>", line 1, in -toplevel-
    l[0][0]
TypeError: unsubscriptable object
>>> l[0] 
1
>>> 1[0] 

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

The compiler reports unsubscriptable object ?? confused , dazzled i am ???!!??
The same list now holds integer instead of strings and l[0][0][0]
which worked fine  earlier on strings doesn't seem to work on
integers???
Any help is greatly appreciated.



-- 
cheers,
Ishwor Gurung