Implement PEP 750 – Template Strings

[lysnikolaou]

See PEP 750 for more details.

Linked PRs

• gh-132661: Implement PEP 750 #132662
• GH-132661: Add string.templatelib.convert() #135217
• GH-132661: Document t-strings and templatelib #135218
• gh-132661: Document t-strings and templatelib #135229
• gh-132661: Disallow Template/str concatenation after PEP 750 spec update #135996
• gh-132661: Add default value (of "") for Interpolation.expression #136441
• [3.14] gh-132661: Add default value (of "") for Interpolation.expression (GH-136441) #136511
• [3.14] GH-132661: Add string.templatelib.convert() (GH-135217) #136671

[JelleZijlstra]

We still need documentation.

[picnixz]

Oh my bad!

[lysnikolaou]

Yes, let's keep this open for docs (planned to do that during the PyCon sprints) and some initial bug fixes that'll be needed.

[encukou]

We just got to string literals in #127833, an effort to refresh the language reference.

You're probably the best person to document t-strings, but I suggest not worrying much about details in the Lexical Analysis & Syntax chapters: we'll clean up any duplications, unclear references, etc. later.
Or @blaisep should be at the sprints if you want to collaborate in person.

[lysnikolaou]

Sounds good! cc also @pauleveritt and @davepeck who'll be working on docs as well