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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Sat, 23 Jun 2012 23:34:26 -0600
Subject: Re: How can i call array_length to get the length of array object?
To: gmspro <gmspro@yahoo.com>
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On Sat, Jun 23, 2012 at 8:23 PM, gmspro <gmspro@yahoo.com> wrote:
> I'm trying to call this function, http://hg.python.org/cpython/file/3b7230997425/Modules/arraymodule.c#l657
>
> Is that possible to call that function?
>
> I know it's possible to do:
> >>>len(arr)

You call it just like that.  array_length is the C implementation of
__len__ for arrays.

> Doesn't it call this :
> http://hg.python.org/cpython/file/c0eab397f098/Python/bltinmodule.c#l1283
> instead of this:
> http://hg.python.org/cpython/file/3b7230997425/Modules/arraymodule.c#l657

Yes, and builtin_len calls PyObject_Size, which in turn calls the
object's sq_length method, which is defined to be array_length for
arrays.