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Nick Craig-Wood nick at craig-wood.com
Fri Oct 8 09:29:57 CEST 2004


Alex Martelli <aleaxit at yahoo.com> wrote:
> >     sentinel = []
> 
>  It's fine, but I would still suggest using the Canonical Pythonic Way To
>  Make a Sentinel Object:
> 
>      sentinel = object()
> 
>  Since an immediate instance of type object has no possible use except as
>  a unique, distinguishable placeholder, ``this thing here is a sentinel''.

Yes a good idiom which I didn't know (still learning) - thanks!

This only works in python >= 2.2 according to my tests.

Its also half the speed and 4 times the typing

  $ /usr/lib/python2.3/timeit.py 'object()'
  1000000 loops, best of 3: 0.674 usec per loop
  $ /usr/lib/python2.3/timeit.py '[]'
  1000000 loops, best of 3: 0.369 usec per loop

But who's counting ;-)

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick



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