[Python-Dev] Re: Suggested changes to PEP 215

[Ka-Ping Yee]

On Mon, 14 Jan 2002, Jason Orendorff wrote:
> One of the examples in PEP 215 is a bit wrong, I think.
>
>         >>> print $'\$a'
>         5
>
> This should output a backslash before the 5, because the
> string '\$a' has a backslash character in it.

You are correct.  I'll make this change.

> Also, for clarity, PEP 215 should explicitly specify
> that the substitution only occurs once.
[...]
> Maybe there should also be examples demonstrating that $-strings
> adopt the local namespace.

Sure, that wouldn't hurt.  More examples are a good idea.

> Consider:
>
>     def f(str):
>         # The argument 'str' masks the builtin str() function.
>         a, b = find_stuff(str)
>         print $'a = $a, b = $b'
>         return a, b
>
> It should be specified that $-strings do not use the local
> "str" and "unicode" names to find str() and unicode()

Good point.  Perhaps it is better to simply describe a
transformation using '%s' and '%' instead of 'str' and '+'
to avoid this potential confusion altogether.


-- ?!ng