Why are some methods/functions named in this way in python? __len__ underscoreunderscoreNAMEunderscoreunderscore
Is there any speciality of naming such methods? --- On Sun, 6/24/12, Ian Kelly <ian.g.ke...@gmail.com> wrote: From: Ian Kelly <ian.g.ke...@gmail.com> Subject: Re: How can i call array_length to get the length of array object? To: "gmspro" <gms...@yahoo.com> Cc: "python-list" <python-list@python.org> Date: Sunday, June 24, 2012, 12:34 AM On Sat, Jun 23, 2012 at 8:23 PM, gmspro <gms...@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.
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