Thanks Nathan,
very interesting insight.
Am 17.11.2015 um 19:32 schrieb Nathan Rusch:
These two snippets are pretty much functionally identical:
with group:
# Do something...
# ------
group.begin()
try:
# Do something...
finally:
group.end()
The `with`statement works with objects that implement Python's context
manager protocol
(https://docs.python.org/2/reference/datamodel.html#with-statement-context-managers).
Basically, if a class implements __enter__ and __exit__ methods, it
can be used as the context manager in a `with` statement. When the
block inside the `with` statement begins, the context manager's
.__enter__() method is called, and when the block exits, the context
manager's .__exit__() method is called unconditionally (even if an
exception occurs in the block).
When using a Group node as a context manager, its .begin() method will
be called by .__enter__(), and .end() will be called by .__exit__().
Thus, this is redundant:
with group:
group.begin()
# Do something...
group.end()
It's worth noting that Nuke currently always returns the current
context to the root node when a group context is exited, rather than
to whatever context it was in before the context was changed to the
group, though this is logged as a bug.
Hope that helps.
-Nathan
*From:* Justin GD <mailto:j.grosde...@gmail.com>
*Sent:* Tuesday, November 17, 2015 9:58 AM
*To:* Nuke Python discussion
<mailto:nuke-python@support.thefoundry.co.uk>
*Subject:* Re: [Nuke-python] nuke.zoom and in group button
Hi all,
That's a good question;
I've been using the /*with */statement as well with success.
I'm curious of what is the best method.
Cheers,
Justin
2015-11-17 17:24 GMT+00:00 Den Serras <denserras...@gmail.com
<mailto:denserras...@gmail.com>>:
This leads to a slightly tangential discussion... I used to always use:
with group:
(inner node stuff)
which generally seemed to work; but so many people use begin() that
now I play it safe and do:
with group:
group.begin()
(inner node stuff)
group.end()
But perhaps someone can explain what the theoretical and functional
differences are between "with group" and "group.begin()", and whether
by combining them I'm causing even more problems...
Thanks!
Den
On Tue, Nov 17, 2015 at 1:29 AM, Johan Forsgren
<j.a.forsg...@gmail.com <mailto:j.a.forsg...@gmail.com>> wrote:
Root().begin() worked wonderfully, I had actually no idea that it
existed at all, thanks!
2015-11-16 18:05 GMT+01:00 Mike Frank <michaeljfr...@gmail.com
<mailto:michaeljfr...@gmail.com>>:
nuke.Root().begin()
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