Re: [Python-Dev] Draft proposal: Implicit self in Python 3.0 :: ASPN Mail Archive

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MyASPN >> Mail Archive >> python-dev

python-dev

Re: [Python-Dev] Draft proposal: Implicit self in Python 3.0
by Thomas Wouters other posts by this author
Jan 8 2006 7:58AM messages near this date

Re: [Python-Dev] Draft proposal: Implicit self in Python 3.0 | Re: [Python-Dev] Draft proposal: Implicit self in Python 3.0

On Sun, Jan 08, 2006 at 07:35:53AM -0800, Ralf W. Grosse-Kunstleve wrote:

>  IIUC, "self" is first looked up in the local dictionary.

No. Local variables are stored in a tuple (more or less,) and indexed by,
er, index. Loading a local variable onto the stack is a fairly fast
operation.

>  Please try the code below to see the performance impact. As an alternative to a
>  copy/paste exercise try this:
>  
>  wget http://cci.lbl.gov/~rwgk/python/self_lookup.py
>  python self_lookup.py

>  The output with Python 2.4.1/Fedora3/Opteron is:
>  
>  loop_function: 13.10
>     loop_class: 17.11

The main difference isn't the lookup of 'self', it's the attribute retrieval
of 'x' from 'self'.

-- 
Thomas Wouters <thomas@[...].net> 

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