What is the command to determine an object's type?

[Tino Lange]

On Tue, 05 Feb 2002 22:38:49 GMT, "Fredrik Lundh"
<fredrik at pythonware.com> wrote:

Hi Fredrik!

(1) if type(l) == types.ListType:
>or better:
(2) if type(l) is types.ListType: 
>or even better:
(3) if isinstance(l, types.ListType):

Why is "if isinstance(l, types.ListType):" even better than the rest?
What do you mean by "better"?

I just compared the speed of execution (using Python 2.1 on Linux) and
found consistently:
(2) is the fastest, the comes (3), (1) is much slower.

So I would guess (2) is the most effective implementation?

Tino