Ross Biro <rb...@interfacefinancial.com> added the comment:
I'm currently writing a language translator between two domain specific computer languages. Because some expressions occur repeatedly, but in slightly different contexts, I make multiple passes. The first pass reduces everything it can and leaves place holder objects for things it can't reduce. Later passes replace the objects with their final expression in the new language. The final expression varies by context, so every time it's reevaluated, it could change. I would really like to handle things like a + b as "{a} + {b}".format(a=a, b=b) This works great when a and b are strings. But when they are place holder objects, I wasn't able to find a good solution. Although the Formatter class came so close that I thought I would suggest the change. What I ended up doing was replacing objects with unique strings so that I could use format and then using regular expressions on the output string to split it into an array and replace the string identifiers with the original objects. The change I've suggested to the Formatter class would have allowed me to skip the regular expressions. Ross On Mon, Mar 11, 2019 at 11:47 PM Lisa Roach <rep...@bugs.python.org> wrote: > > Lisa Roach <lisaroac...@gmail.com> added the comment: > > Can you give an example use case for this? F-strings are the newer method > of string interpolation, I'm not sure it's worth putting effort into adding > features to string.Formatter. > > ---------- > nosy: +lisroach > > _______________________________________ > Python tracker <rep...@bugs.python.org> > <https://bugs.python.org/issue36159> > _______________________________________ > -- *Ross Biro* | CTO _______________________________________ O: 240-380-2231| F: 240-556-0361 <(240)%20556-0361> The Interface Financial Group <https://interfacefinancial.com/> CONFIDENTIALITY NOTICE: This email message, including any attachments, is for the sole use of the intended recipient/s and may contain confidential & privileged information. Any unauthorized review, use, disclosure, or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original messages and any attachments. ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue36159> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com