How to read source code of python?

[Lee]

On Jun 10, 7:53 am, Floris Bruynooghe <floris.bruynoo... at gmail.com>
wrote:
> On Jun 10, 8:55 am, Thomas Jollans <tho... at jollans.com> wrote:
>
> > On 06/10/2010 07:25 AM, Qijing Li wrote:
>
> > > Thanks for your reply.
> > > I'm trying to understand python language deeply and  use it efficiently.
> > > For example: How the operator "in" works on list? the running time is
> > > be O(n)?  if my list is sorted, what the running time would be?
>
> Taking this example, you know you want the "in" operator.  Which you
> somehow need to know is implemented by the "__contains__" protocol
> (you can find this in the "expressions" section of the "Language
> Reference").
>
> Now you can either know how objects look like in C (follow the
> "Extending and Embedding" tutorial, specifically the "Defining New
> Types" section) and therefore know you need to look at the sq_contains
> slot of the PySequenceMethods sturcture.  Or you could just locate the
> list object in Objects/listobjects.c (which you can easily find by
> looking at the source tree) and search for "contains".  Both ways
> will lead you pretty quickly to the list_contains() function in
> Objects/listobject.c.  And now you just need to know the C-API (again
> in the docs) to be able to read it (even if you don't that's a pretty
> straightforward function to read).
>
> Hope that helps
> Floris

It does help, thank you.
I think I know where to start, I found somethings I'm interested in in
listobject.c.