Inada Naoki <songofaca...@gmail.com> added the comment:
I agree with Batuhan.
Although bytecode for class annotations seems inefficient, it is difficult to
optimize without breaking backward compatibility.
You can write arbitrary code in class/module block which dynamically manipulate
__annotations__.
```
class Foo:
__annotations__["spam"] = "list"
ham: tuple
```
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42525>
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