from string.templatelib import Template, Interpolation string.templatelib is a new module in the standard library for Python 3.14 that holds the types we need: Template for the type hint to the ...

Since strings behave in a similar fashion to lists, the programmer can use indices to replace the contents of a string. There are two methods to accomplish this.

Previously, type annotations had no way to indicate a given variable needed to be a string literal—that is, a string defined in source code. The new typing.LiteralString annotation fixes that.