object doesn't have an __enter__/__exit__ yet docs say it does

Documentation

Here's the current docs in the Python data model on object.__enter__:

object.__enter__(self)

And object.__exit__:

object.__exit__(self, exc_type, exc_value, traceback)

However, with Python 3.10.3, we see neither of these methods belong to object:

>>> object.__enter__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: type object 'object' has no attribute '__enter__'. Did you mean: '__ne__'?
>>> object.__exit__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: type object 'object' has no attribute '__exit__'. Did you mean: '__init__'?

I think the docs could be:

• More clear that __enter__ and __exit__ are not methods on object
• Mention where they come from (just being defined within your object to match the interface)

Thank you for your consideration!

从 issue 中链接的 Python 数据模型文档里关于 object.enter 和 object.exit 的章节开始，并根据 Python 3.10.3 核对其当前措辞。更新文档，明确这些方法并未在 object 上定义，并说明上下文管理器对象会定义它们以提供该接口；当文档描述的行为与运行时行为一致时，即表示完成。