On Nov 2, 2012 8:06 AM, "Yuval Greenfield"
On Thu, Nov 1, 2012 at 1:40 PM, Nick Coghlan
wrote: I've been remiss in not mentioning the new alternative in 3.3 for handling nesting of complex context management stacks:
with contextlib.ExitStack() as cm: p1 = cm.enter_context(open('/etc/passwd')) p2 = cm.enter_context(open('/etc/passwd'))
(Note: ExitStack is really intended for cases where the number of context managers involved varies dynamically, such as when you want to make a CM optional, but you *can* use it for static cases if it seems appropriate)
Go's "defer" is quite a neat solution for these hassles if anyone's in
the mood for a time machine discussion.
Go was one of the reference points for the ExitStack design (it's a large part of why the API also supports providing callbacks directly to the exit stack, not just as context managers). Cheers, Nick. -- Sent from my phone, thus the relative brevity :)
Yuval Greenfield