On 5/4/05, Alex Martelli <[EMAIL PROTECTED]> wrote:
>
> On May 4, 2005, at 01:57, Paul Moore wrote:
> >
> > I can't think of a reasonable condition which wouldn't involve reading
> > the file - which either involves an inner loop (and we already can't
> > break out of two loops, so the third one implied by the opening block
> > makes things no worse), or needs the whole file reading (which can be
>
> Looking for a file with a certain magicnumber in its 1st two bytes...?
>
> for name in filenames:
> opening(name) as f:
> if f.read(2) == 0xFEB0: break
>
> This does seem to make real-life sense to me...
Yes, that'd do. I can't say I think it would be common, but it's a
valid case. And the workaround is the usual messy flag variable:
for name in filenames:
found = False
opening(name) as f:
if f.read(2) == 0xFEB0: found = True
if found: break
Yuk.
Paul.
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