# [Tutor] the sense of brackets

spir denis.spir at free.fr
Sat Nov 22 22:58:48 CET 2008

```W W a écrit :
> On Sat, Nov 22, 2008 at 9:42 AM, spir <denis.spir at free.fr> wrote:
>
>> I have long thought "[]" /simply/ is a list constructor syntax.
>> What do you think of the following?
>>
>> t = "aze"
>> print t, list(t), [t]
>> print list(list(t)), list([t]), [list(t)], [[t]]
>> ==>
>> aze ['a', 'z', 'e'] ['aze']
>> ['a', 'z', 'e'] ['aze'] [['a', 'z', 'e']] [['aze']]
>
> Consider the following:
> In [1]: list("Hello")
> Out [1]: ['H', 'e', 'l', 'l', 'e', 'o']
> and the list docstring:
> list() -> new list
> list(sequence) -> new list initialized from sequence's items
> so list(list(t)) makes perfect sense: list(t) is ['a', 'z' ,'e'] and
> list(list(t)) simply creates a new list initialized from that list's items
> HTH,
> Wayne

Yep! What surprises me is the behaviour of [] instead. I can understand that
list(t) != [t]
but
[list(t)], [[t]] --> [['a', 'z', 'e']] [['aze']]
is a bit strange to me.

denis

```