[Python-ideas] String interpolation for all literal strings

[Barry Warsaw]

On Aug 06, 2015, at 03:37 PM, Yury Selivanov wrote:

>What if we introduce f-strings in the following fashion:
>
>1. ``f'string {var}'`` is equivalent to
>``'string {var}'.format(**locals())`` -- no new formatting
>syntax.

You really do want to include globals too, with locals overriding them.

>2. there is a 'sys.set_format_hook()' function that allows
>to set a global formatting hook for all f-strings:
>
>     # pseudo-code
>     def i18n(str, vars):
>         if current_lang != 'en':
>             str = gettext(str, current_lang)
>         return str.format(vars)
>
>     sys.set_format_hook(i18n)
>
>This would allow much more convenient way not only to format
>strings, but also to integrate various i18n frameworks:
>
>    f'Welcome, {user}' instead of _('Welcome, {user}')

I don't think you want this to be a process-global hook since different
modules may be using a different i18n systems.

Cheers,
-Barry
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