"str"(expr)"str" interpolation syntax

Sean 'Shaleh' Perry shalehperry at attbi.com
Tue Sep 10 16:08:53 EDT 2002

On Tuesday 10 September 2002 12:35, Beni Cherniavksy wrote:
> Hi all.
> I was searching for a new interpolation syntax that would use quotes
> for starting/ending the interpolated part (I don't feel comfortable
> putting code inside unclosed quotes...)
> After contemplating some horrors like $"""str"expr"str""" or
> $("str" expr "str"), I noticed that currently both  "(  and  )"  are
> illegal (first because strings are not callable, second is a syntax
> error).  So I propose that a parenthesized expresion near a string would
> imply concatenation.  In other words,
> 	"foo"(x * 3)"bar"
> would be equivallent to
> 	"foo" + str(x * 3) + "bar".
> This works of course with only one side, e.g. "foo"(x) or (y)"bar" but in
> longer cases it would be good style to add empty strings on either end,
> e.g. ""(y)"bar".  And of course it all works with single quotes too.  One
> of the benefits over current interpolation PEPs is that you can change the
> quote type in the middle...
> What do you think?

having not read the PEPs, why is this needed?

s = "foo%dbar" % (x*3,) # this works

and as you showed above so does str(x*3).

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