But IIUC once a conversion was added, it could not be removed without
breaking backward compatibility. So I think we should be cautious about
building what is in effect a Domain Specific Language and take care to
get it (as) right (as possible) first time.
Rob Cliffe
On 21/04/2021 22:44, Cameron Simpson wrote:
On 21Apr2021 10:14, Paul Moore <p.f.mo...@gmail.com> wrote:
On Wed, 21 Apr 2021 at 09:01, Serhiy Storchaka <storch...@gmail.com> wrote:
Do we need support of more standard conversions? Do we want to
support
custom conversions (registered globally as encodings and error
handlers). re.escape, html.escape and shlex.quote could be very useful
in some applications.
That appeals to me just because I like generic features in general,
but I'm not sure there are sufficient benefits to justify the
complexity for what would basically be a small convenience over
calling the function directly.
I frequently use str.format and str.format_map to produce strings from
formats provided as configuration; in those methods I can't use
arbitrary functions (injection, anyone?) For example:
fstags ls -o format-string-here ...
to produce a particular listing format.
I would _frequently_ like to be able to provide custom conversions. At
present I'm using elaborate hacks based on __getattr__ etc to recognise
things like this:
'{x} is {x_lc} in lowercase'
where the _lc suffix is caught and a value computed from "x".
Custom conversions would let me use this:
'{x} is {x!lc} in lowercase'
just by registering 'lc' as a conversion from my code. Chaining then per
Serhiy's other suggestion would bring a fair amount of power.
Cheers,
Cameron Simpson <c...@cskk.id.au>
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