Hi everyone,

I've been playing around with implementing PEP 750 template strings in MicroPython. For those unfamiliar, these are the new t-strings coming in Python 3.14:

name = "World"
template = t"Hello {name}"  # creates a Template object instead of a string
print(template)
# Template(strings=('Hello ', ''), interpolations=(Interpolation('World', 'name', None, ''),))

You can already try them in CPython 3.14.0b2 or in this browser playground: https://t-strings.help/playground.html

My motivation is that I want to use template strings with PyScript for building reactive web UIs (think React, but in Python - the tdom library shows what's possible). The playground above uses a patched Pyodide build which works but is quite heavy - a MicroPython WASM build would be much more suitable for browser environments.

I've got a basic implementation working on the unix port:

• Added parsing for t"..." literals
• Created Template and Interpolation types
• Made the string.templatelib module work

Everything builds and the tests pass when MICROPY_PY_TSTRINGS is enabled. When disabled, there's zero impact on code size.

Before I go further and clean things up for a PR, I wanted to check:

1. Is there interest in this feature?
2. The full PEP 750 spec includes some complex stuff - would a simpler subset be better for MicroPython?
3. Any major concerns I should be aware of?

I know new features need discussion first, so here I am :)

Links:

• PEP 750: https://peps.python.org/pep-0750/
• tdom library (uses t-strings): https://github.com/t-strings/tdom

Thanks!