without parameter names, something like `func range(int, int)` can become dangerous because you dont know if the first parameter is the start and end or is it start and length?
`range(start: int, end: int)` makes it clear at the call site what is going on and gives your brain enough info to not mess up the parameters (especially when refactoring or fixing bugs in existing code)
Why can't I have a variable that has a protocol as type?
Why can't I pass a substring to a function that wants a string?
Why is string parsing so much harder than it should be?
Mike Ash answered[0] this question back in 2015.
[0] https://www.mikeash.com/pyblog/friday-qa-2015-11-06-why-is-s...