Mailman 3 July 2016 - docs

[issue27422] Deadlock when mixing threading and multiprocessing
by R. David Murray July 4, 2016

July 4, 2016

R. David Murray added the comment: To clarify the GIL issue (for davin, I guess? :): if the library you are using to interface with the FORTRAN code drops the GIL before calling the FORTRAN, then you *can* take advantage of multiple cores. It is only the python code (and some of the code interacting with the python objects) that is limited to executing on one core at a time. (As far as I know it isn't restricted to be the *same* core unless you set CPU affinity somehow, and I have no idea if … [View More]

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[issue27422] Deadlock when mixing threading and multiprocessing
by Martin Ritter July 4, 2016

July 4, 2016

Martin Ritter added the comment: Dear Davin, Thanks for the input, I was perfectly aware that the "solution" I proposed is not realistic. But the feedback that multiprocessing is using threads internally is useful as I can quickly abandon the idea to do something like the check I proposed in our code base without spending time on it. I was aware of the Gil, I just did not anticipate that big a problem when mixing threads and processes with rather simple python code. My bad, sorry for the … [View More]

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[issue27422] Deadlock when mixing threading and multiprocessing
by Davin Potts July 4, 2016

July 4, 2016

Davin Potts added the comment: While I believe I understand the motivation behind the suggestion to detect when the code is doing something potentially dangerous, I'll point out a few things: * any time you ask for a layer of convenience, you must choose something to sacrifice to get it (usually performance is sacrificed) and this sacrifice will affect all code (including non-problematic code) * behind the scenes multiprocessing itself is employing multiple threads in the creation and … [View More]

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[issue27422] Deadlock when mixing threading and multiprocessing
by Martin Ritter July 4, 2016

July 4, 2016

Martin Ritter added the comment: I agree that this is error prone and can not be fixed reliably on the python side. However, python makes it very easy to mix these two, a user might not even notice it if a function he calls uses fork and thus just use a ThreadPoolExecutor() because it's the simplest thing to do. What could be an nice solution in my opinion if the multiprocessing module could check if there are already multiple threads active on process creation and issue a warning if so. This … [View More]

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python cam style docs on mac
by Manikandan Bakthavatchalam July 3, 2016

July 3, 2016

Hi, First, thanks for this wonderful language. I am using python on my mac OSX El Capitan. Where can I find the offline help files on my mac? In windows, I see people using the offline chm. This is very useful while programming without having to browse the internet for docs each time. regards, Manikandan

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How best to submit a change?
by Jim Belton July 3, 2016

July 3, 2016

Hi all: I'm more than happy to hack some restructured text. How best to submit a patch to a doc? I'm not going to take the time to improve unless I know how to get my change included. I'd be hacking the 2.7 branch, since that's the version I seem to be working in. Hopefully, 3 will start getting more traction in real world dev.ops. environments soon. Thanks, Jim.

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[issue27429] xml.sax.saxutils.escape doesn't escape multiple characters safely
by Xiang Zhang July 3, 2016

July 3, 2016

Xiang Zhang added the comment: Put a not in escape's doc. ---------- Added file: http://bugs.python.org/file43617/sax_escape_doc.patch _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue27429> _______________________________________

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[issue27429] xml.sax.saxutils.escape doesn't escape multiple characters safely
by Serhiy Storchaka July 3, 2016

July 3, 2016

Changes by Serhiy Storchaka <storchaka+cpython(a)gmail.com>: ---------- assignee: -> docs@python components: +Documentation nosy: +docs@python type: behavior -> enhancement _______________________________________ Python tracker <report(a)bugs.python.org> <http://bugs.python.org/issue27429> _______________________________________

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[issue27422] Deadlock when mixing threading and multiprocessing
by Raymond Hettinger July 2, 2016

July 2, 2016

Raymond Hettinger added the comment: FWIW, this isn't even a Python specific behavior. It is just how threads, locks, and processes work (or in this case don't work). The code is doing what it is told to do which happens to not be what you want (i.e. a user bug rather than a Python bug). I think a FAQ entry would be a reasonable place to mention this (it comes up more often than one would hope). ---------- assignee: -> docs@python components: +Documentation nosy: +docs@python … [View More]

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Usage error in the documentation for the “del” statement
by David Wheelock July 1, 2016

July 1, 2016

Usage error in the documentation for the “del” statement here: https://docs.python.org/2/reference/simple_stmts.html#del In the following statement: “Deletion is recursively defined very similar…” “similar” should be changed to “similarly” David Wheelock, GISP Application Specialist david.wheelock(a)ag.ok.gov<mailto:david.wheelock@ag.ok.gov> Oklahoma Department of Agriculture, Food and Forestry 2800 North Lincoln Boulevard Oklahoma City, OK 73105-4298 Phone: (405) 522-5477 FAX: (405) … [View More]

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