[Python-Dev] PEP 343 - next steps

[Guido van Rossum]

[Nick]
> I also added a new question to the Wiki regarding what, if any,
> guarantees will be made regarding when (or if) asynchronous interrupts
> will be blocked. Given that the call to __enter__() can invoke
> arbitrary Python code, is pushing the with statement setup inside a
> single opcode actually sufficient?

Not sufficient if __enter__ is written in Python; in that case,
*nothing* can be done to make it sufficient.

The single opcode makes it possible to implement __enter__ in C to
solve the issue in specific cases.

> It also considers the possibility of using with statements in an RAII
> style by acquiring the resource in __init__ or __new__ rather than
> __enter__.

Python isn't C++; you shouldn't do that.

> This is a topic that got a brief mention during early discussion here,
> but doesn't seem to be covered in the current version of PEP 343.

I haven't been infected with the RAII meme, so I can't help you here.

-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)