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

From	eryk sun <eryksun@gmail.com>
Newsgroups	comp.lang.python
Subject	Re: Well, I finally ran into a Python Unicode problem, sort of
Date	2016-07-03 23:46 +0000
Message-ID	<mailman.50.1467589634.2295.python-list@python.org> (permalink)
References	<0589521b-648a-47c1-8afa-6f746e0fb901@googlegroups.com> <CACL+1au8==WBQScKWFMwoYEFU27XbSi_ywJod+na-BdHLcUaJg@mail.gmail.com>

Show all headers | View raw

On Sun, Jul 3, 2016 at 6:58 AM, John Ladasky <john_ladasky@sbcglobal.net> wrote:
> 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 ∇.

Del is a mathematical operator to take the gradient. It's not part of
the name. For `∇f`, the operator is `∇` and the function name is `f`.
Python lacks a mechanism to add user-defined operators. (R has this
capability.) Maybe this feature could be added. To make parsing
simple, user-defined operators could be limited to non-ASCII symbol
characters (math and other -- Sm, So). That simple option is off the
table if we allow symbol characters in names.

Adding an operator to the language itself requires a PEP. Recently PEP
465 added an `@` operator for matrix products. For example:

    >>> x = np.array([1j, 1])
    >>> x @ x
    0j
    >>> x @ x.conj() # Hermitian inner product
    (2+0j)

Note that using a non-ASCII operator was ruled out:

http://legacy.python.org/dev/peps/pep-0465/#choice-of-operator

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

csiph-web