Re: Well, I finally ran into a Python Unicode problem, sort of

From	Jussi Piitulainen <jussi.piitulainen@helsinki.fi>
Newsgroups	comp.lang.python
Subject	Re: Well, I finally ran into a Python Unicode problem, sort of
Date	2016-07-03 10:29 +0300
Organization	A noiseless patient Spider
Message-ID	<lf57fd341sr.fsf@ling.helsinki.fi> (permalink)
References	<0589521b-648a-47c1-8afa-6f746e0fb901@googlegroups.com>

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John Ladasky writes:

[- -]

> The nabla symbol (∇) is used in the naming of gradients.  Python isn't
> having it.  The interpreter throws a "SyntaxError: invalid character
> in identifier" when it encounters the ∇.
>
> I am now wondering what constitutes a valid character for an
> identifier, and how they were chosen.  Obviously, the Western alphabet
> and standard Greek letters work.  I just tried a few very weird
> characters from the Latin Extended range, and some Cyrillic
> characters.  These are also fine.

I think they merely extended the identifier syntax to Unicode: one or
more letters, underscores and digits, not starting with a digit. The
nabla symbol is not classified as a letter in Unicode, so it's not
allowed under this rule, and there is no other rule to allow it.

(Hm. Python seems to understand that the character occurs in what is
intended to be an identifier. Perhaps that's a default error message.)

Thread

Well, I finally ran into a Python Unicode problem, sort of John Ladasky <john_ladasky@sbcglobal.net> - 2016-07-02 23:58 -0700
  Re: Well, I finally ran into a Python Unicode problem, sort of Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-07-03 00:07 -0700
    Re: Well, I finally ran into a Python Unicode problem, sort of Marko Rauhamaa <marko@pacujo.net> - 2016-07-03 10:26 +0300
      Re: Well, I finally ran into a Python Unicode problem, sort of Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-07-03 01:38 -0700
        Re: Well, I finally ran into a Python Unicode problem, sort of Marko Rauhamaa <marko@pacujo.net> - 2016-07-03 12:01 +0300
          Re: Well, I finally ran into a Python Unicode problem, sort of Chris Angelico <rosuav@gmail.com> - 2016-07-04 01:14 +1000
          Re: Well, I finally ran into a Python Unicode problem, sort of Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-07-03 14:21 -0700
    Re: Well, I finally ran into a Python Unicode problem, sort of John Ladasky <john_ladasky@sbcglobal.net> - 2016-07-03 09:24 -0700
  Re: Well, I finally ran into a Python Unicode problem, sort of Rustom Mody <rustompmody@gmail.com> - 2016-07-03 00:26 -0700
  Re: Well, I finally ran into a Python Unicode problem, sort of Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-07-03 10:29 +0300
    Re: Well, I finally ran into a Python Unicode problem, sort of Robert Kern <robert.kern@gmail.com> - 2016-07-03 10:16 +0100
  Re: Well, I finally ran into a Python Unicode problem, sort of Chris Angelico <rosuav@gmail.com> - 2016-07-03 17:41 +1000
    Re: Well, I finally ran into a Python Unicode problem, sort of John Ladasky <john_ladasky@sbcglobal.net> - 2016-07-03 11:39 -0700
      Re: Well, I finally ran into a Python Unicode problem, sort of MRAB <python@mrabarnett.plus.com> - 2016-07-03 20:41 +0100
      Re: Well, I finally ran into a Python Unicode problem, sort of Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-07-03 14:28 -0700
        Re: Well, I finally ran into a Python Unicode problem, sort of Steven D'Aprano <steve@pearwood.info> - 2016-07-04 12:33 +1000
          Re: Well, I finally ran into a Python Unicode problem, sort of Rustom Mody <rustompmody@gmail.com> - 2016-07-03 22:14 -0700
            Re: Well, I finally ran into a Python Unicode problem, sort of Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-07-04 01:11 -0700
              Re: Well, I finally ran into a Python Unicode problem, sort of Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-07-04 13:10 +0300
              Re: Well, I finally ran into a Python Unicode problem, sort of Marko Rauhamaa <marko@pacujo.net> - 2016-07-04 12:04 +0300
            Re: Well, I finally ran into a Python Unicode problem, sort of Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-07-04 09:08 +0300
  Re: Well, I finally ran into a Python Unicode problem, sort of Alain Ketterlin <alain@universite-de-strasbourg.fr.invalid> - 2016-07-03 11:53 +0200
    Re: Well, I finally ran into a Python Unicode problem, sort of Marko Rauhamaa <marko@pacujo.net> - 2016-07-03 14:01 +0300
      Re: Well, I finally ran into a Python Unicode problem, sort of Christian Gollwitzer <auriocus@gmx.de> - 2016-07-03 13:16 +0200
        Re: Well, I finally ran into a Python Unicode problem, sort of Marko Rauhamaa <marko@pacujo.net> - 2016-07-03 14:22 +0300
          Re: Well, I finally ran into a Python Unicode problem, sort of Christian Gollwitzer <auriocus@gmx.de> - 2016-07-03 16:05 +0200
            Re: Well, I finally ran into a Python Unicode problem, sort of Marko Rauhamaa <marko@pacujo.net> - 2016-07-03 17:39 +0300
          Re: Well, I finally ran into a Python Unicode problem, sort of Random832 <random832@fastmail.com> - 2016-07-03 16:49 -0400
            Re: Well, I finally ran into a Python Unicode problem, sort of Marko Rauhamaa <marko@pacujo.net> - 2016-07-04 00:25 +0300
      Re: Well, I finally ran into a Python Unicode problem, sort of BartC <bc@freeuk.com> - 2016-07-03 12:50 +0100
        Re: Well, I finally ran into a Python Unicode problem, sort of Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-07-03 14:26 -0700
  Re: Well, I finally ran into a Python Unicode problem, sort of eryk sun <eryksun@gmail.com> - 2016-07-03 23:46 +0000
    Re: Well, I finally ran into a Python Unicode problem, sort of Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-07-03 17:00 -0700
      Re: Well, I finally ran into a Python Unicode problem, sort of BartC <bc@freeuk.com> - 2016-07-04 01:17 +0100
        Re: Well, I finally ran into a Python Unicode problem, sort of Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-07-03 17:24 -0700
          Re: Well, I finally ran into a Python Unicode problem, sort of BartC <bc@freeuk.com> - 2016-07-04 01:39 +0100
            Re: Well, I finally ran into a Python Unicode problem, sort of Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-07-03 18:15 -0700
              Re: Well, I finally ran into a Python Unicode problem, sort of Random832 <random832@fastmail.com> - 2016-07-03 22:20 -0400
              Re: Well, I finally ran into a Python Unicode problem, sort of Rustom Mody <rustompmody@gmail.com> - 2016-07-04 05:16 -0700
              Re: Well, I finally ran into a Python Unicode problem, sort of BartC <bc@freeuk.com> - 2016-07-04 11:26 +0100
        Re: Well, I finally ran into a Python Unicode problem, sort of Steven D'Aprano <steve@pearwood.info> - 2016-07-04 12:30 +1000
          Re: Well, I finally ran into a Python Unicode problem, sort of Ned Batchelder <ned@nedbatchelder.com> - 2016-07-04 05:47 -0700
            Re: Well, I finally ran into a Python Unicode problem, sort of BartC <bc@freeuk.com> - 2016-07-04 15:36 +0100
              Re: Well, I finally ran into a Python Unicode problem, sort of Ned Batchelder <ned@nedbatchelder.com> - 2016-07-04 07:46 -0700
                Re: Well, I finally ran into a Python Unicode problem, sort of BartC <bc@freeuk.com> - 2016-07-04 17:16 +0100
                Re: Well, I finally ran into a Python Unicode problem, sort of Marko Rauhamaa <marko@pacujo.net> - 2016-07-04 19:44 +0300
          Re: Well, I finally ran into a Python Unicode problem, sort of BartC <bc@freeuk.com> - 2016-07-04 11:05 +0100
            Re: Well, I finally ran into a Python Unicode problem, sort of Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-07-04 13:26 +0300
      Re: Well, I finally ran into a Python Unicode problem, sort of Random832 <random832@fastmail.com> - 2016-07-03 22:16 -0400

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