why no "do : until"?

[Aahz Maruch]

In article <mailman.978660367.22251.python-list at python.org>,
Tim Peters <tim.one at home.com> wrote:
>
>A study I did at the time said that about 15% of all "for" loops in Python
>code were of the form
>
>    for i in range(len(a)):
>
>and that's both an obscure and inefficient way to spell the underlying idea.

Huh.  I've always tended to do this instead:

i = 0
for tmp in a:
    ...
    i += 1
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