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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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Xref: csiph.com comp.lang.python:22443

> You can already do essentially that without adding a special-case string=
=A0=0A=0A> formatting method to the general methods we already have.=0A> =
=0A>>>>  balls =3D 5=0A>>>>  people =3D 3=0A>>>>  'The {people} people have=
 {balls} =0A> balls.'.format(**locals())=0A> 'The 3 people have 5 balls.'=
=0A=0A=0AClearly dynamic strings are much more powerful,=0Aallowing arbitra=
ry expressions inside. It is also=0Amore terse and readable, since we need =
no dictionary.=0A=0AI would probably rather liken dynamic expressions=0Aas =
a little brother of computable documents=A0in=A0=0AMathematica. It is a new=
 kind of expression,=0Arather than formatting -- though it has formatting=
=0Aconnections.=A0=0A=0ADynamic strings are mainly useful at time of=0Awrit=
ing readable code before compilation.=A0=0AThe compiler can choose to conve=
rt it into=0Aa string formatting expression, of course.=0ATo efficiently fo=
rmat=A0strings at runtime,=A0=0Athe best choice (especially=0Afor safty rea=
sons) is string formatting,=A0=0Anot evaluating a dynamic string.=0A=0AOn t=
he implementation, I would suppose new=A0=0Asyntax is needed (though very s=
mall).=0A=0AYingjie