The following proposed solution is not intended to be a solution, it
goes completely against the zen of python. [Type import this into the
python command interpreter]

I brought it down to two lines:-

l = range(6)
[1 if b!=4 else l.__delslice__(0,len(l)) for b in l][:-1]

itertools would still be a better approach in my opinion.

Just because I'm curious to know, can anyone bring it shorter[even if
its cryptic] than this without invoking any Python Library.

P.S. Once again I would not recommend using this as Explicit is better
than Implicit
P.P.S. It is strongly undesirable for us humans to use anything
starting with __ :)


On May 15, 5:10 pm, "Geoffrey Clements"
<[EMAIL PROTECTED]> wrote:
> "urikaluzhny" <[EMAIL PROTECTED]> wrote in message
>
> news:[EMAIL PROTECTED]
> On May 15, 10:06 am, "Terry Reedy" <[EMAIL PROTECTED]> wrote:
>
> > "urikaluzhny" <[EMAIL PROTECTED]> wrote in message
>
> >news:[EMAIL PROTECTED]
> > | It seems that I rather frequently need a list or iterator of the form
> > | [x for x in <> while <>]
>
> > I can think of two ways to interpret that.
> >> I mean like [x for x in <A> if <B>], only that it breaks the loop when
> >> the expression <B> is false.
>
> def gen(a):
>     for x in a:
>         if B: break
>         yield x
>
> a_gen = gen(A)
>
> # now iterate over a_gen
>
> --
> Geoff

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