[Python-Dev] PEP-498: Literal String Formatting
steve at pearwood.info
Tue Aug 11 04:17:42 CEST 2015
On Mon, Aug 10, 2015 at 09:23:15PM +0200, Guido van Rossum wrote:
> Anyway, this generalization from print() is why I want arbitrary
> expressions. Wouldn't it be silly if we introduced print() today and said
> "we don't really like to encourage printing complicated expressions, but
> maybe we can introduce them in a future version"... :-)
That's a straw-man argument. Nobody is arguing against allowing
arbitrary expressions as arguments to functions.
If you want a fair analogy, how about the reluctance to allow arbitrary
expressions as decorators?
@[spam, eggs, cheese][switch]
As far as I can see, the non-straw argument is that f-strings be limited
to the same subset of expressions that format() accepts: name and
attribute look-ups, and indexing.
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