Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From: Ian Kelly <ian.g.kelly@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: Problems using struct pack/unpack in files, and reading them.
Date: Sat, 14 Nov 2015 10:04:36 -0700
Lines: 27
Message-ID: <mailman.334.1447520685.16136.python-list@python.org>
References: <20151113192045.GA9913@z-sverige.nu> <CALwzidknLk3w8NWJqhYXjCFy4uBm79dxhBn=oaXCtxfJu-d-_g@mail.gmail.com> <mailman.310.1447454532.16136.python-list@python.org> <56469f14$0$1612$c3e8da3$5496439d@news.astraweb.com> <mailman.314.1447470111.16136.python-list@python.org> <5646c95a$0$1597$c3e8da3$5496439d@news.astraweb.com> <mailman.329.1447515842.16136.python-list@python.org> <87vb94ikuv.fsf@elektro.pacujo.net>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
In-Reply-To: <87vb94ikuv.fsf@elektro.pacujo.net>
Precedence: list
Xref: csiph.com comp.lang.python:98819

On Nov 14, 2015 9:56 AM, "Marko Rauhamaa" <marko@pacujo.net> wrote:
>
> Ian Kelly <ian.g.kelly@gmail.com>:
>
> > For somebody reading one of these uses of unary plus in real code, I
> > imagine it would be a bit of a WTF moment if it's the first time
> > they've encountered it. I don't recall ever seeing any code that
> > actually used this, though.
>
> What I don't understand is why there is a unary + but no unary /:
>
>    -x =E2=89=A1 0 - x
>    +x =E2=89=A1 0 + x
>    /x =E2=89=A1 1 / x
>    //x =E2=89=A1 1 // x
>    *x =E2=89=A1 1 * x
>
> You could write:
>
>    r =3D //(//r1 + //r2 + //r3)
>
> for
>
>    r =3D 1 // (1//r1 + 1//r2 + 1//r3)

Unary integer division seems pretty silly since the only possible results
would be 0, 1 or -1.