Paul Ganssle writes:
> If you didn't already know what the square brackets did, how would
> you try and find out?
First I'd look it up in Python Essential Reference (Hi, @dabeaz! it
won't be there, though ;-). Then I'd go to the Language Reference for
"def" and "class". And if that failed, then I'd go buy Barry Warsaw
lunch.
OK, not everybody has a personal relationship with senior core devs,
but is asking people to read the Language Reference really so bad?
> An additional benefit is that I find some of these examples to be a bit
> visually cluttered with all the syntax:
>
> def func1[T](a: T) -> T: ... # OK
> class ClassA[S, T](Protocol): ... # OK
Looks like the boomer version (square*) of C++ template variables. Of
course, people learn Python to escape from C++, so maybe that's not
persuasive.
* telling you how old I am without telling you how ooooold I am
> Which would look less cluttered with a prefix clause:
>
> @with type T def func1(a: T) -> T: ... # OK
> @with type S @with type T class ClassA(Protocol): ... # OK
For me, that's absolutely awful from a readability standpoint. Put
the "def" or "class" 10-20 characters in from the margin?
I guess "stacked" it's no less readable than any decorator, but I also
don't like overloading the well-defined decorator notation with magic.
@with type T
def func1(a: T) -> T: ... # OK
@with type S
@with type T
class ClassA(Protocol): ... # OK
A thought: would it be possible to actually make it a with statement?
with Typevar() as T:
def func1(a: T) -> T
Of course there might have to be magic in Typevar, but it would be far
more palatable to me than giving unary @ two kinds of magic.
IMO YMMV of course.
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