dynamic attribute syntax

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  • castironpi
    #1

    dynamic attribute syntax

    Hi all,
    Thinking of a syntax for 'getattr' and 'setattr' dynamic access.

    'obj.prop' has an easy access, but

    att= 'prop'
    getattr( obj, att )

    is much clumsier, while no less useful, maybe more.

    What are the changes, pros and cons, involved in something like:

    obj:att for a dynamic access, and obj.att for static?

    Snice readability is a factor, I'm open to other markings than ':'.
    '$' and '?' are available, and I note that a~b, a:b, and, a!b for
    identifiers 'a' and 'b' are unambiguous.

    Tags: None
    • Paul Boddie
      #2
      Re: dynamic attribute syntax

      On 17 Aug, 21:29, castironpi <castiro...@gma il.comwrote:
      >
      What are the changes, pros and cons, involved in something like:
      >
      obj:att for a dynamic access, and obj.att for static?
      A previous proposal and discussion can be found here:

      PEP 363 – Syntax For Dynamic Attribute Access | peps.python.org
      http://www.python.org/dev/peps/pep-0363/
      Dynamic attribute access is currently possible using the “getattr” and “setattr” builtins. The present PEP suggests a new syntax to make such access easier, allowing the coder for example to write:


      Paul

        Comment

        • castironpi
          #3
          Re: dynamic attribute syntax

          On Aug 17, 2:46 pm, Paul Boddie <p...@boddie.or g.ukwrote:
          On 17 Aug, 21:29, castironpi <castiro...@gma il.comwrote:
          >
          >
          >
          What are the changes, pros and cons, involved in something like:
          >
          obj:att for a dynamic access, and obj.att for static?
          >
          A previous proposal and discussion can be found here:
          >
          PEP 363 – Syntax For Dynamic Attribute Access | peps.python.org
          http://www.python.org/dev/peps/pep-0363/
          Dynamic attribute access is currently possible using the “getattr” and “setattr” builtins. The present PEP suggests a new syntax to make such access easier, allowing the coder for example to write:

          >
          Paul
          Thanks for the reference. Well, check out the two alternatives, a~b
          and a!b, which are easy on the eyes, and weren't proposed, but don't
          allow expressions. (Turns out 'if a:b' is valid, so never mind that
          one.) I also won't let you forget that $ and ? are unused so far
          too. I see syntax was one of the complaints.

            Comment

            • Fredrik Lundh
              #4
              Re: dynamic attribute syntax

              castironpi wrote:
              'obj.prop' has an easy access, but
              >
              att= 'prop'
              getattr( obj, att )
              >
              is much clumsier, while no less useful, maybe more.
              maybe more? ok, you *are* utterly and completely unable to post
              anything that makes any sense at all to anyone that uses Python.
              plonkeliplonk.

                Comment

                • castironpi
                  #5
                  Re: dynamic attribute syntax

                  On Aug 17, 3:05 pm, Fredrik Lundh <fred...@python ware.comwrote:
                  castironpi wrote:
                  'obj.prop' has an easy access, but
                  >
                  att= 'prop'
                  getattr( obj, att )
                  >
                  is much clumsier, while no less useful, maybe more.
                  >
                  maybe more?  ok, you *are* utterly and completely unable to post
                  anything that makes any sense at all to anyone that uses Python.
                  plonkeliplonk.
                  More constructive contributions on both sides there. Good one.

                    Comment

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