Re: string interpolation for python

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Date	Mon, 2 Apr 2012 00:39:42 -0700 (PDT)
From	Yingjie Lan <lanyjie@yahoo.com>
Subject	Re: string interpolation for python
To	Terry Reedy <tjreedy@udel.edu>, "python-list@python.org" <python-list@python.org>
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> You can already do essentially that without adding a special-case string 

> formatting method to the general methods we already have.
> 
>>>>  balls = 5
>>>>  people = 3
>>>>  'The {people} people have {balls} 
> balls.'.format(**locals())
> 'The 3 people have 5 balls.'


Clearly dynamic strings are much more powerful,
allowing arbitrary expressions inside. It is also
more terse and readable, since we need no dictionary.

I would probably rather liken dynamic expressions
as a little brother of computable documents in 
Mathematica. It is a new kind of expression,
rather than formatting -- though it has formatting
connections. 

Dynamic strings are mainly useful at time of
writing readable code before compilation. 
The compiler can choose to convert it into
a string formatting expression, of course.
To efficiently format strings at runtime, 
the best choice (especially
for safty reasons) is string formatting, 
not evaluating a dynamic string.

On the implementation, I would suppose new 
syntax is needed (though very small).

Yingjie

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Thread

Re: string interpolation for python Yingjie Lan <lanyjie@yahoo.com> - 2012-04-02 00:39 -0700
  Re: string interpolation for python Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2012-04-02 11:01 +0300
  Re: string interpolation for python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-04-02 08:26 +0000
    Re: string interpolation for python Chris Angelico <rosuav@gmail.com> - 2012-04-02 18:47 +1000
    Re: string interpolation for python Yingjie Lan <lanyjie@yahoo.com> - 2012-04-02 02:11 -0700
      Re: string interpolation for python Duncan Booth <duncan.booth@invalid.invalid> - 2012-04-02 10:19 +0000
      Re: string interpolation for python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-04-02 11:54 +0000
        Re: string interpolation for python Yingjie Lan <lanyjie@yahoo.com> - 2012-04-02 05:40 -0700
          Re: string interpolation for python Laurent Claessens <moky.math@gmail.com> - 2012-04-02 15:02 +0200
            Re: string interpolation for python Yingjie Lan <lanyjie@yahoo.com> - 2012-04-02 07:25 -0700
            Re: Re: string interpolation for python Evan Driscoll <driscoll@cs.wisc.edu> - 2012-04-02 15:36 -0500
          Re: string interpolation for python mwilson@the-wire.com - 2012-04-02 10:46 -0400
            Re: string interpolation for python mwilson@the-wire.com - 2012-04-02 11:34 -0400
              Re: string interpolation for python Yingjie Lan <lanyjie@yahoo.com> - 2012-04-02 09:02 -0700
      Re: string interpolation for python rusi <rustompmody@gmail.com> - 2012-04-02 06:04 -0700
    Re: string interpolation for python Yingjie Lan <lanyjie@yahoo.com> - 2012-04-02 02:17 -0700
      Re: string interpolation for python alex23 <wuwei23@gmail.com> - 2012-04-02 22:47 -0700
    Re: string interpolation for python Chris Angelico <rosuav@gmail.com> - 2012-04-02 19:56 +1000
    Re: string interpolation for python Chris Rebert <clp2@rebertia.com> - 2012-04-02 03:23 -0700
    Re: string interpolation for python Yingjie Lan <lanyjie@yahoo.com> - 2012-04-02 04:46 -0700
    Re: string interpolation for python Yingjie Lan <lanyjie@yahoo.com> - 2012-04-02 05:00 -0700
    Re: string interpolation for python Chris Angelico <rosuav@gmail.com> - 2012-04-03 00:58 +1000
      Re: string interpolation for python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-04-02 18:56 +0000
    Re: string interpolation for python Yingjie Lan <lanyjie@yahoo.com> - 2012-04-02 08:49 -0700
    Re: string interpolation for python Chris Angelico <rosuav@gmail.com> - 2012-04-03 08:38 +1000
      Re: string interpolation for python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-04-02 23:18 +0000
    Re: string interpolation for python Yingjie Lan <lanyjie@yahoo.com> - 2012-04-02 18:57 -0700

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