I think PEP 501 would be a better approach to this.
Eric
> On May 4, 2019, at 11:51 AM, Serhiy Storchaka <storch...@gmail.com> wrote:
>
> Currently str.format() and f-strings support three converters. Converting is
> specified by the "!" character followed by a letter which denotes the
> converter.
>
> s: str()
> r: repr()
> a: ascii()
>
> In some cases it would be useful to apply other converters. One obvious
> example is escaping special characters ("&", "<", ">", "'" and '"') for XML
> and HTML. Other applications may need other converters, for example escaping
> special characters (like \xff) for Telnet, or escaping non-BMP characters for
> displaying on Tk widget, or escaping delimiters and special characters for
> shell, or translating to other language.
>
> I do not think that it is practical to provide additional standard converters
> for all above cases, but what if create a special registry similar to
> registries for encodings and error handlers and allow a user to register
> custom converters? We could extend str.format() and f-strings to accept
> arbitrary letters after "!", or maybe even allow multi-character names of
> converters.
>
> It is less important for f-strings because you can use arbitrary expressions,
> but even in this case f"Hello, {name!x}!" or f"Hello, {name!xml}!" looks
> better than f"Hello, {html.escape(name)}!" or f"Hello, {x(name)}!".
>
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