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From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Thu, 14 Jul 2011 14:00:06 -0600
Subject: Re: Possible File iteration bug
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On Thu, Jul 14, 2011 at 1:46 PM, Billy Mays <noway@nohow.com> wrote:
> def getLines(f):
> =A0 =A0lines =3D []
> =A0 =A0for line in f:
> =A0 =A0 =A0 =A0lines.append(line)
> =A0 =A0return lines
>
> with open('/var/log/syslog', 'rb') as f:
> =A0 =A0lines =3D getLines(f)
> =A0 =A0# do some processing with lines
> =A0 =A0# /var/log/syslog gets updated in the mean time
>
> =A0 =A0# always returns an empty list, even though f has more data
> =A0 =A0lines =3D getLines(f)
>
>
>
>
> I found a workaround by adding f.seek(0,1) directly before the last
> getLines() call, but is this the expected behavior? =A0Calling f.tell() r=
ight
> after the first getLines() call shows that it isn't reset back to 0. =A0I=
s
> this correct or a bug?

This is expected.  Part of the iterator protocol is that once an
iterator raises StopIteration, it should continue to raise
StopIteration on subsequent next() calls.