Is '[' a function or an operator or an language feature?

[MRAB]

Peng Yu wrote:
> On Fri, Jul 16, 2010 at 5:42 PM, Terry Reedy <tjreedy at udel.edu> wrote:
>> On 7/16/2010 1:01 PM, Peng Yu wrote:
>>> I mean to get the man page for '[' like in the following code.
>>>
>>> x=[1,2,3]
>> You might find my Python symbol glossary useful.
>> https://code.google.com/p/xploro/downloads/detail?name=PySymbols.html
> 
> This is for Python 3. Is there one for Python 2.x?
> 
Is anyone /still/ using Python 2.x? ;-)