PEP 750 – Template Strings (t-strings) have been accepted

kstrauser · 2025-04-10T20:45:07 1744317907

Most excellent! I love f-strings and replaced all the various other string interpolation instances in my code with them, but they have the significant issue that you can't defer evaluating them. For instance, you can write:

  >>> template = 'Hello, {name}'
  >>> template.format(name='Bob')
  'Hello, Bob'

Until this, there wasn't a way to use f-strings formatting without interpolating the results at that moment:

  >>> template = f'Hello, {name}'
  Traceback (most recent call last):
    File "", line 1, in 
      template = f'Hello, {name}'
                           ^^^^
  NameError: name 'name' is not defined

It was annoying being able to use f-strings almost everywhere, but str.format in enough odd corners that you have to put up with it.

simonw · 2025-04-10T20:51:19 1744318279

I'm excited about this. I really like how JavaScript's tagged template literals https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe... can help handle things like automatic HTML escaping or SQL parameterization, it looks like these will bring the same capability to Python.

unsnap_biceps · 2025-04-10T20:53:41 1744318421

This is super exciting but I wish they added a function to render the template to a string rather then having everyone write their own version of basic rendering.

ydnaclementine · 2025-04-10T20:54:38 1744318478

can't wait to have my linter tell me I should be using t-strings instead of f-strings. apologies for not being patient enough to read through this to find it, but I hope they can remove f-strings:

> There should be one-- and preferably only one --obvious way to do it.

pphysch · 2025-04-10T20:44:54 1744317894

This could be a game-changer for applications that involve lots of HTML, SQL, or other languages that tend to be embedded within Python programs. Frankly, HTML templating is the worst part of Python webdev DX for me.

Excited to see what libraries and tooling comes out of this.

paulddraper · 2025-04-10T20:52:13 1744318333

These developer ergonomics reduce injection 90% in my experience.

When concatenating strings is the harder approach, it is really beautiful.

ohnoesjmr · 2025-04-10T20:51:12 1744318272

Whats wrong with jinja?

pphysch · 2025-04-10T20:56:04 1744318564

Jinja et al. are fine. But they still forces me to choose Python OR HTML. I have to jump between files and LSPs. t-strings pave the way for true Python+HTML seamless DX.

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