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Caleb Hattingh added the comment:
The traditional way this done is with a finite number of workers pulling work
off a queue. This is straightforward to set up with builtins:
from uuid import uuid4
import asyncio, random
async def worker(q: asyncio.Queue):
while job := await q.get
Caleb Hattingh added the comment:
Kyle is correct. By analogy with Kyle's example, the following example has no
gather, only two nested futures:
```
# childfut.py
import asyncio
async def f(fut):
await fut
async def g(t):
await asyncio.sleep(t)
async def main():
fut_g
Caleb Hattingh added the comment:
Can reproduce also on 3.8. Another version that "works" (raises the exception)
is
task = loop.create_task(test())
del task
Suggests there's something going on with reference counting or garbage
collection. In the version that &qu
Caleb Hattingh added the comment:
The dict unpacking generalizations that I posted were added in Python 3.5,
which is pretty old by now. (But, true, is in Python 3 and not Python 2). This
is the PEP: https://www.python.org/dev/peps/pep-0448/
The new syntax that Brandt posted will indeed
Caleb Hattingh added the comment:
dict syntax tools make it fairy easy to compose new dicts from old ones with
overrides:
subprocess.run(..., env={**os.environ, 'FOO': ..., 'BAR', ...}, ...)
Would this be sufficient to avoid the copy/pasting boilerplate?
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Caleb Hattingh added the comment:
This change seems fine.
Markus,
I'm curious if there is a specific reason you prefer to use the default
executor rather than replacing it with your own? Is it just convenience or are
there other reasons?
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Caleb Hattingh added the comment:
@dontbugme This is a very old problem with threads and sub-processes. In the
general case (cross-platform, etc) it is difficult to kill threads and
sub-processes from the outside. The traditional solution is to somehow send a
message to the thread
Caleb Hattingh added the comment:
Hmm, my recent comment looks rude but I didn't intend it to be that way. What I
mean is: there are many, many more users of asyncio.run than there are of
teleton, so any change made to asyncio.run is going to affect more people than
the other way round. So
Caleb Hattingh added the comment:
@heckad You should instead ask the maintainers of teleton how to use their
library with asyncio.run, not the other way round.
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Caleb Hattingh added the comment:
Ok, I see now. The improvement with only a single producer/consumer might be
marginal, but the proposition that `queue.cancel()` might simplify the
situation with multiple producers and/or consumers is more compelling.
Usually, assuming M producers and N
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Caleb Hattingh added the comment:
We can't allow both an `executor=` kwarg, as well as **kwargs for the target
func, unfortunately. If we do `executor=`, we'll again have to force users to
use functools.partial to wrap their functions that take kwargs
Caleb Hattingh added the comment:
Even before task groups land, this API can be easily improved by adding
asyncio.run_in_executor(func, *args, **kwargs)
- Only valid inside a coro or async context (uses get_running_loop internally)
- Analogous to how `loop.create_task` became
Caleb Hattingh added the comment:
> asyncio.wait_for is still confusing
Perhaps the confusion can be fixed with improvements to the docs? To me, these
specific docs seem pretty clear now, but I might not be a good judge of that.
> However, we still have the case where a misbehaving Ta
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Caleb Hattingh added the comment:
I'm interested in how this change would affect the pattern of shutting down a
queue-processing task.
How would one decide between whether to cancel the queue or the task? (I'm
asking for real, this is not an objection to the PR). For example, looking
Caleb Hattingh added the comment:
I'm removing the GUI section of the chat case study. Yury was right, it's not
going to add anything useful. The CLI chat client will work well because
prompt-toolkit has actual support for asyncio. Tkinter does not, and I think
it'll be better to add a GUI
Caleb Hattingh added the comment:
FYI I'm going to be using the 3rd-party prompt-toolkit for the chat client.
(The server depends only on asyncio only). I put several hours research into
finding a way for the CLI chat client to be not terrible, but it gets very
complicated trying to manage
Caleb Hattingh added the comment:
That was an long two months, apologies. I've made some fixes based on review
comments and cleaned up some more of the code samples. The primary outstanding
pieces are the client component of the chat application case study, and the GUI
integration section
Caleb Hattingh added the comment:
Somehow I missed that there's been an open issue on this. Like others I've
written a bunch of different incarnations of an "elapsed" context manager over
the years. Always for the more crude "how long did this take" reason like
Da
Caleb Hattingh added the comment:
A quick note to say I have not abandoned this, it's just that life got
complicated for me in late 2018. I intend to pick up progress again within the
next month or two.
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Caleb Hattingh added the comment:
@cheryl.sabella I am ok with closing this, but the original motivation for this
work was from @zack.ware so he should weigh in.
I am not going to work on this any further for the forseeable future (I've got
my hands full already with the asyncio docs I'm
Caleb Hattingh added the comment:
I've added a few ideas for items in the "cookbook" page, which you'll see in
the PR. If anyone has suggestions for more or better cookbook entries
(recipes?), feel free to mention here or in the PR, I check both places. I
expect to get more ti
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I tested the Python 3.7.0 release version for Mac, the download called "macOS
64-bit installer" with checksum ae0717a02efea3b0eb34aadc680dc498 on this page:
https://www.python.org/downloads/release/python-370/
I downloaded, installed tha
Caleb Hattingh added the comment:
I set up a basic structure under "Doc/library/asyncio-tutorial" as suggested,
and opened a PR to show you how that looks. When I make
more progress on a section, I'll post an update here.
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Caleb Hattingh added the comment:
A CLI client is a necessary step along the way anyway, so that sounds good by
me.
You suggested:
> I'd organize the tutorial in a dedicated directory like
> "Doc/library/asyncio-tutorial/"
I had a look at the source tree, there is an
Caleb Hattingh added the comment:
> * I think we should stick to your structure and push things to
> docs.python.org as soon as every next section is somewhat ready.
Ok. I'll get a PR going for the start page of the tutorial.
> * Every big section should probably have its own page
New submission from Caleb Hattingh :
Hi Yury,
As discussed, below is a very rough outline of a proposed TOC for an asyncio
tutorial. No content has been written yet (only what you see below). I think we
should nail down the TOC first.
Asyncio Tutorial
Proposed Table
Caleb Hattingh <caleb.hatti...@gmail.com> added the comment:
Yep, sounds good.
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Caleb Hattingh <caleb.hatti...@gmail.com> added the comment:
It looks like the check for an existing sphinx-build passes, and so no new venv
is made, but this also means that blurb doesn't get installed. I was concerned
about this, but figured that at least the buildbots would create ne
Caleb Hattingh <caleb.hatti...@gmail.com> added the comment:
Hi Ned
It's still supposed to allow both. It sounds like it's not working properly.
I'll have a look. FYI, I worked on this for Zach Ware who is the primary
stakeholder for this feature.
Rgds
Caleb
> On 28 Nov 2017, a
Caleb Hattingh <caleb.hatti...@gmail.com> added the comment:
No worries. I've made a new PR 4346. The old one was unsalvagable I'm afraid.
Too many other people got added to the notifications list as a result of my
incorrect rebase. The new one i
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Caleb Hattingh <caleb.hatti...@gmail.com> added the comment:
I messed up the PR through a failed rebase (trying to rebase my PR on top of
upstream). I closed the PR as a result. I have now fixed up my feature branch,
but I have not resubmitted the PR. Since the PR was left alone fo
Caleb Hattingh <caleb.hatti...@gmail.com> added the comment:
This looks like a dupe, or at least quite closely related to
https://bugs.python.org/issue26259. If the PR resolves both issues that one
should be closed too.
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New submission from Caleb Hattingh:
Under guidance from zware during Pycon sprints, I've changed the Doc/ Makefile
to automatically create a virtual environment and install Sphinx, all as part
of the `make html` command.
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Caleb Hattingh added the comment:
The PR has been merged by Mariatta so I think this can be closed.
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Caleb Hattingh added the comment:
Oops, sorry! The PR was wrong because it auto-assumes the main cpython repo,
but my PR is in the devguide repo. This is the URL for the PR:
https://github.com/python/devguide/pull/206
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New submission from Caleb Hattingh:
The official devguide at https://github.com/python/devguide does not include
instructions on exactly how to build the docs! If, after cloning, you simply
type `make`, you get some helpful output:
$ make
Please use `make ' where is one of
html
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Caleb Hattingh added the comment:
Presumably PEP488 (and the 4 years of inactivity) means that this issue could
be closed?
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Caleb Hattingh added the comment:
I struggled with this issue, and eventually found the recommendations about
linking with homebrew's OpenSSL on StackOverflow or similar, and then only
later found this issue here (and with it the link to the devguide); but the
*first* places I looked were
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On Wed, 15 Apr 2009 15:47:05 +0200, mousem...@gmail.com wrote:
But, lambda functions can't be pickled. I would like to pickle my
objects, and i would really like to use parallel python (which
requires pickling).
If you are fixated on using lambda, you could probably use Recipe 7.6:
Pickling
On Apr 21, 11:02 pm, [EMAIL PROTECTED] wrote:
Hi,
I am using Python Thread library for my parallel processing course
project. I am doing matrix convolution on a multi-processor machine
running Solaris. I just found out that no speed-up is obtained with
threading. It is probably because of
Pat wrote:
I have to do a big programm. Could someone give me some suggests about
IDE (on Linux) and books to learn.
http://groups.google.com/groups/search?q=python+ideqt_s=Search
Lots and lots to read :)
Caleb
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I want to build rsync server that can run in linux and windows, and
configure by python. So I'm looking for something like rsync for python.
I find rsync.py and pysync. But rsync.py looks like a client mode,
it can't be a rsync server, is it? Can pysync be a rsync server?
Hi nienfeng
Hi Paul
Thanks for the kind words!
No, thank _you_ for taking the time to write such a useful document.
regards
Caleb
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The Night Blogger wrote:
Is there a way to push data to Microsoft Excel Word from a Python
Application
On Windows, it's easy after you install the win32 extensions. For
example, for
python:
import win32com.client
xl = win32com.client.Dispatch('Excel.Application')
after which you can
jansenh wrote:
hi comp.lang.python.
I need some newbe advice on idiomatic use of Python dictionaries.
I have service with a dictionary which holds a bunch of objects as
values, and an ID as key to each object. Then I want to change an
objects state based on its key. The way I am doing this
Hi Brian
You could make great use of XML-RPC here. XML-RPC is /really/ easy to
use.
Here is a simple example:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/81549
You put procedures on the server that will check the args against a the
required result, and report back to the student
Hi Kevin
The other posters helped you with configParser, which is what you
wanted, i.e. text file access.
However, you can also get persistance really cheaply with pickling, if
you don't need the saved data to be text-editable:
(from memory)
verboseSettings = {}
verboseSettings['Detailed'] =
Hi Erich
If you're going to be doing a lot of string substitution, you should
look at the Templating support in the library:
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/304005
and (a little bit fancier):
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/335308
Regards
Caleb
I spent way too much time reading the recent massive 500-messages
thread, and then spent even more time (perhaps better spent) reading
wider on some aspects of the debate.
This recently-found link sets out (from one possibly-biased POV, I
guess) how the rift between GNU Emacs and XEmacs occurred:
Hi Eric
Check that .py and .pyw are in your PATHEXT environment variable
(are you using Windows?). Then, if the folder that cabel is in is in
your PATH environment variable, and the correct association for .py
files is set up (i.e. they get run by python.exe),
either
os.system('cabel')
or
I have had this same problem before, and what I ended up doing was
writing my own far more limited config parser that would create lists
for repeated named assignments.
Who is the maintainer of ConfigParser? Perhaps a keyword option can
be added so that this kind of behaviour can be added at
Hi Martin
Pretty much exactly what I wanted :)
How up-to-date does Debian keep its package list for python addons, or
are you running Unstable? My big problem, being in South Africa, is
that I have to get any distros on cover CDs or order from
distro-resellers, and they never have Testing or
Hi everyone
I suspect this has come up before, but google and group searches for
python package index query or pypi query and the like haven't
turned anything up.
I want to monitor the versions of the list of packages I like having
around, and I expect that the python package index might be a
Steve
I agree with you. If my vote means anything, I vote against it.
The Board realises that this change will be
contentious. There are many advantages
to making it, however, which we feel will
benefit the Python community at large
and the PSF membership in particular.
Users who wish to
WAIT-
Did I just get caught by an April Fools Joke?
I have a nasty feeling about this :))
C
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Felipe
I get the same results as you. You make a good point about not
iterating when it's not needed. I played around with your test code
and found some interesting things:
1. enumerate vs. range(len()) has very little overhead (something I
have wondered about)
In my code, making the change
Hi
I tried several Google searches to no avail. I read through pretty
much most of the online docs at the matplotlib sourceforge site, but
didn't find what I was looking for. I went through the axis.py and
ticker.py code today, trying to find out how to set the number of
points (ticks) on an
If you can find some API documentation for PDFMWord.dll, you can call
its methods with the ctypes python module.
Caleb
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Ben,
Thank you.
Caleb
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John,
Thank you.
Caleb
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Hi Dennis
Sure, I get it. I do most of my work in Delphi, which is, shall we
say, not lax about floating-point types. Thinking about this more, I
realise my initial interest was in looking at the // operator as
something new, whereas I now see it probably just wraps math.floor();
obviously
Hi
Use the timeit module, like so:
from timeit import Timer
t = Timer('[i for i in range(1)]') # The string is code to execute
(for timing)
print t.timeit(100) # execute it 100 times and print the result
0.222389936447
I would appreciate it if you could present your results in this
Hi Ernesto
SPE, or Stani's python editor is actually a decent IDE that can lauch
the winpdb debugger to step through code, with side windows for locals,
and watches and so on. It's not exactly integrated debugging a la
Delphi, but in general my need for debugging is much less with python;
the
John
In python, strings are immutable - you have to create a new string no
matter what you do.
Also, I suspect you meant to say:
alphabet = string.ascii_lowercase
code = alphabet[2:] + alphabet[:2]
I had a similar need recently for a guitar chord generator program I've
been working on. Here
Terry
That is very succint. Rewriting my shift function given earlier:
import string
alpha = string.ascii_lowercase
print alpha
abcdefghijklmnopqrstuvwxyz
def shift(lst, n):
return [lst[(i+len(lst)-n)%len(lst)] for i,item in enumerate(lst)]
print shift(alpha,2)
['y', 'z', 'a',
Hi John
Your code works on some folders but not others. For example, it works
on my /usr/lib/python2.4 (the example you gave), but on other folders
it terminates early with StopIteration exception on the
os.walk().next() step.
I haven't really looked at this closely enough yet, but it looks as
Thanks John
I will use your code :) 30% improvement is not insignificant, and
that's what I was looking for.
I find the log function a little harder to read, but I guess that is a
limitation of me, not your code.
Caleb
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Hi Fredrik
Fair enough; I wasn't precise. Upon further reflection, I actually
meant floor division, via the // operator. In the following snippet:
4/2
2
4//2
2
4.0/2.0
2.0
4.0//2
2.0
4.0//2.0
2.0
We know the last two operations can only return what are effectively
integer numbers (or
Christoph
I understand the explanation regarding the underlying math.floor()
call. Were I using this functionality in my code,
int(a//b)* some_list
would not be something I consider a big deal. However, I see what
you're saying: The multiplcation by list can only work with an int, and
you
Hi Dan
Pythonwin just adds support for specifically MS Windows features, most
prominently COM; writing Excel scripts in python is so cool. The
standard python distribution for windows runs perfectly on windows.
I'm not sure whether this was clear to you or not. Also, Thomas
ctypes and comtypes
Hi Christoph
On my linux py-2.4.1:
4.0//2 # Integer division, but still returns a float.
2.0
4.0//2 == 2
True
4.0//2 doesn't return an integer, but the equality against an integer
still holds. I agree that integer division should return an integer,
because using the operator at all means
Hi Peter
Clearly I misunderstood what Martin was saying :)I was comparing
operations on lines via the file generator against first loading the
file's lines into memory, and then performing the concatenation.
What does .readlines() do differently that makes it so much slower
than
Hi everyone
[Short version: I put a some code below: what changes can make it run
faster?]
Unless you have a nice tool handy, calculating many folder sizes for
clearing disk space can be a click-fest nightmare. Looking around, I
found Baobab (gui tool); the du linux/unix command-line tool; the
I tried this:
from timeit import *
#Try readlines
print Timer('import
gzip;lines=gzip.GzipFile(gztest.txt.gz).readlines();[i+1 for i in
lines]').timeit(200) # This is one line
# Try file object - uses buffering?
print Timer('import gzip;[i+1 for i in
gzip.GzipFile(gztest.txt.gz)]').timeit(200)
Hi
The documentation for the python profiler in the python library
reference is extremely readable (well done James Roskin!?).
Profile your code, and when you find where the speed problem occurs,
try pitching just that section of code in comp.lang.python. You will
likely get much feedback.
Hi all
I want to write python extensions with FPC (Free Pascal Compiler,
http://www.freepascal.org). In Delphi, this is trivially easy due to
the great work of the P4D (Python-for-Delphi, http://mmm-experts.com/)
guys; however, when aiming for cross-platform binary extensions, that
strategy
Hi Derek
I went for an embarrassingly long time without knowing about
enumerate(). It doesn't directly answer your question about counting
*within* nests, but I am going to tell you this on the off chance you
don't know yet (and apologies if you do):
This:
count = 0
for animal in zoo:
a =
Well, there it is:
* Added support for Free Pascal Compiler (http://www.freepascal.org/)
and Lazarus Project (http://www.lazarus.freepascal.org/)
Thanks to Michiel du Toit ([EMAIL PROTECTED])
That was easy. I just saw the new support for D2k6 recently.
thx Ravi
Caleb
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Hi
I don't think this is what you want (a string representation of the
argument passed to a function as that argument is at runtime is way
beyond my abilities), but this can retrieve the literal text in the
function call as it appears in the .py file, assuming you have the .py
file available
Hi
Being a Delphi user at work, I know what you mean :)
The best python IDE I have found is Stani's Python Editor (SPE), and I
think Stani himself replied to your message as well.
It integrates wxGlade, which is nice for form-building, although I don't
really do much of that with the python
York
Short answer: yes
We use python and R at work, and in general you will find python syntax a
little cleaner for functionality they have in common. R is better for
some of the more hard-wired stats stuff, though.
On Mon, 19 Sep 2005 20:04:37 +0200, York [EMAIL PROTECTED] wrote:
Hi,
The other thing (and this is always true) is that better needs
definition. On purely technical grounds, on average, MSOffice is better
than OO. However, holistically, OO is probably better (no lock-in, open
standards, multiplatform and so on). Those soft issues do matter.
On Mon, 19 Sep
Peter
To my mind, this kind of setup (interface class, or abstact class) is more
usually used in static languages to benefit polymorphism - but python is
dynamically typed, so in which situations would this setup be useful in a
python program? You see, I expected your post to say that it
You know, for several years I was one of those people who simply ignored
posts like this about Vi/Vim because I happened to come across it once on
a sparc machine and thought it was ridiculous that I couldn't figure out
how to type a simple note. I thought that Vi (Vim) was some kind of
Probably, the best place for learning how to build GUI's for Windows, in
general, is to get hold the personal edition of Delphi from the Borland
website. If you want something more specific to Python, it is likely to
be much tougher. You would, for example, have to decide which widget
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