template1 is a function that takes in a parameter evil (with a SanitisedString type that wraps a regular str) and returns the fully expanded str. It is implemented by just returning an f-string equivalent to the t-string in your example. Same with template2.

Using the SanitisedString type forces the user to explicitly call a sanitiser function that returns a SanitisedString and prevents them from passing in an unsanitised str.