Subject: Re: A critic of Guido's blog on Python's lambda
From: (Rob Warnock)
Date: Mon, 15 May 2006 22:09:54 -0500
Newsgroups: comp.lang.python,comp.lang.lisp
Message-ID: <>
Ken Tilton  <> wrote:
| Having the reference implementation is the only thing that makes this 
| conceivably doable in a summer. What you are missing is something I have 
| often also gotten wrong: the core, cool functionality always comes easy 
| in the proof-of-concept stage. We make these ridiculous extrapolations 
| from that to a shipped product and come in five times over budget.

Or as Fred Brooks said it in "The Mythical Man-Month" [paraphrased],
if a program takes one unit of effort, a programming *system* takes
three units of effort, and a programming systems *product* takes nine
units of effort.


Rob Warnock			<>
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