Hi, jumping in here because of a conversation we are having now at PyCon sprints with @CAM-Gerlach , @pauleveritt , and @guido -
Please take a look at work we are doing on https://jimbaker/tagstr. In particular, with respect to the older version of PEP 501 (need to get current with the reopened version, where as I understand it, at least i → t), there’s this issue where we compare this work - Comparison to PEP 501 · Issue #7 · jimbaker/tagstr · GitHub along with an implementation of an i tag linked to that issue (tagstr/interpolation_template.py at main · jimbaker/tagstr · GitHub).
Note that we are currently updating the proof of concept in the work in Update proof of concept with respect to PEP 701 changes · Issue #22 · jimbaker/tagstr · GitHub