4 ms·

I suppose, if you're relying on type stubs. Ordinary in-line type hints won't lie or go out of sync without complaining somewhere though. Defensive code is goo

I suppose, if you're relying on type stubs. Ordinary in-line type hints won't lie or go out of sync without complaining somewhere though. Defensive code is good, but I'm absolutely sick of writing code that has to be defensive about the type of absolutely every variable everywhere. It's ridiculous, verbose, and nearly impossible to do universally. THAT is the worst of both worlds. Having to manually fret about the types that every variable may hold. At the point that you're having to write defensive code due to dynamic types, you've already lost the advantages of dynamic types entirely. I use type hints to say "use and expect these types or get Undefined Behavior", and that contract is good enough for me.

packetlost 3y ago
> Ordinary in-line type hints won't lie or go out of sync without complaining somewhere though This is demonstrably untrue with the default configuration of Mypy. It will silently ignore explicit hints, inline or not, in certain situations.
- LegibleCrimson 3y ago
  I'm going to need an example of that. I tend to use Pyright, but when I used MyPy, I never had it simply ignore explicit hints. If it's demonstrably untrue, you should be able to demonstrate it, right?
  - packetlost 3y ago
    Here's the quickest, simplest example I could come up with off the top of my head: https://paste.sr.ht/~chiefnoah/7e07a961cf266fa620d1fd2d31ba2ce01d492f4a https://paste.sr.ht/~chiefnoah/7e07a961cf266fa620d1fd2d31ba2... This particular issue will get picked up with `--strict`, but it's nearly impossible to do that on a large codebase with typing added post-hoc. Pyright has saner defaults, it catches this particular issue: https://paste.sr.ht/~chiefnoah/80816fded2a08a03ca80804d524ee42ba4ae5fd2 https://paste.sr.ht/~chiefnoah/80816fded2a08a03ca80804d524ee...
    - LegibleCrimson 3y ago
      Thanks for the example. That's happening because the `main` function is an untyped function. You can fix that by changing `def main():` to `def main -> None:` You can also make it pick up with `--check-untyped-defs`. I always used mypy with --strict, so I forgot that it wasn't the default configuration. I agree, though. Pyright has better defaults. It's not great that mypy just completely skips all functions without typing information given. It makes a lot more sense for it to just check everything and assume Any on all unspecified arguments and returns. It's still valuable to type-check the contents of functions with unspecified types.

packetlost 3y ago

> Ordinary in-line type hints won't lie or go out of sync without complaining somewhere though This is demonstrably untrue with the default configuration of Mypy. It will silently ignore explicit hints, inline or not, in certain situations.

LegibleCrimson 3y ago
I'm going to need an example of that. I tend to use Pyright, but when I used MyPy, I never had it simply ignore explicit hints. If it's demonstrably untrue, you should be able to demonstrate it, right?
- packetlost 3y ago
  Here's the quickest, simplest example I could come up with off the top of my head: https://paste.sr.ht/~chiefnoah/7e07a961cf266fa620d1fd2d31ba2ce01d492f4a https://paste.sr.ht/~chiefnoah/7e07a961cf266fa620d1fd2d31ba2... This particular issue will get picked up with `--strict`, but it's nearly impossible to do that on a large codebase with typing added post-hoc. Pyright has saner defaults, it catches this particular issue: https://paste.sr.ht/~chiefnoah/80816fded2a08a03ca80804d524ee42ba4ae5fd2 https://paste.sr.ht/~chiefnoah/80816fded2a08a03ca80804d524ee...
  - LegibleCrimson 3y ago
    Thanks for the example. That's happening because the `main` function is an untyped function. You can fix that by changing `def main():` to `def main -> None:` You can also make it pick up with `--check-untyped-defs`. I always used mypy with --strict, so I forgot that it wasn't the default configuration. I agree, though. Pyright has better defaults. It's not great that mypy just completely skips all functions without typing information given. It makes a lot more sense for it to just check everything and assume Any on all unspecified arguments and returns. It's still valuable to type-check the contents of functions with unspecified types.