Ethan Furman :
> On 12/11/2014 11:14 AM, Guido van Rossum wrote:
>> (I wouldn't be surprised if there wasn't -- while computer clocks
>> have a precision in nanoseconds, that doesn't mean they are that
>> *accurate* at all (even with ntpd running).
>
> The real-world use cases deal with getting th
Mark Roberts :
> it's outright insulting to be told my complaints about writing 2/3
> compatible code are invalid on the basis of "premature optimization".
IMO, you should consider forking your library code for Python2 and
Python3. The multidialect code will look unidiomatic for each dialect.
Whe
Brian Curtin :
> I'm a few inches shorter than Brett, but having done several sizable
> ports, dual-source has never even on the table. I would prefer the
> "run 2to3 at installation time" option before maintaining two versions
> (which I do not prefer at all in reality).
How about "run 3to2 at i
Antoine Pitrou :
> The whole point of scandir is to expose low-level system calls in a
> cross-platform way.
Cross-platform is great and preferable, but low-level system facilities
should be made available even when they are unique to a particular OS.
Marko
_
I have made a full implementation of a balanced tree and would like to
know what the process is to have it considered for inclusion in Python
3.
To summarize, the implementation closely parallels dict() features and
resides in _collectionsmodule.c under the name collections.sortedtree.
It uses so
Guido van Rossum :
> Actually, the first step is publish it on PyPI, the second is to get a
> fair number of happy users there. The bar for getting something
> included into the stdlib is pretty high -- you need to demonstrate
> that there is a need *and* that having it as a 3rd party module is a
Antoine Pitrou :
> Wouldn't a heapq work as well for those two?
In my experience, networking entities typically start a timer at each
interaction and cancel the pending one. So you have numerous timers that
virtually never expire. You might have 100 interactions per second, each
canceling and res
Terry Reedy :
> Perhaps the collections doc should mention that there are other
> specializes container types available on PyPI and either list some or
> point to a wiki page listing some. There must be at least 10 that
> could be included in such a list.
There *is* a relatively high threshold of
Antoine Pitrou :
> Marko Rauhamaa wrote:
>> In my experience, networking entities typically start a timer at each
>> interaction and cancel the pending one. So you have numerous timers
>> that virtually never expire. You might have 100 interactions per
>> second, each
Dan Stromberg :
> It'd likely make sense to have either a pure python implementation, or
> pure python and C-extended, so that Pypy and Jython can share the
> feature with CPython.
Jython can build directly on Java's native SortedMap implementation. The
API should not tie it to a tree. Optimizati
Thomas Wouters :
> Not to mention discussion about whether it shouldn't just be an existing
> PyPI package, like http://pypi.python.org/pypi/blist, rather than a new
> implementation.
I'm fine with any implementation as long as it is in the standard
library.
Marko
__
Raymond Hettinger :
> * An AVL balanced tree isn't the only solution or necessarily the best
> solution to the problem. Tree nodes tend to take more space than
> denser structures and they have awful cache locality (these are the
> same reasons that deques use doubly-linked blocks rather than a pl
Greg Ewing :
> ISO 8601 doesn't seem to define a representation for
> negative durations, though, so it wouldn't solve the
> original problem.
XSD uses ISO 8601 durations and allows a sign before the initial "P".
It would appear PT1M means 60 or 61 seconds. P1D means 23, 24 or 25
hours. P1M mean
Marko Rauhamaa :
> For example, Jython would probably use SortedTree to implement it.
That word just keeps coming out of my keyboard. The Java class is of
course the TreeMap.
Marko
___
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Python-Dev@python.org
ht
Guido van Rossum :
> Yeah, so the pyftp fix is to keep track of how many timers were
> cancelled, and if the number exceeds a threshold it just recreates the
> heap, something like
>
> heap = [x for x in heap if not x.cancelled]
> heapify(heap)
I measured my target use case with a simple emulatio
Nick Coghlan :
> Right, it's not a mere optimisation - it's the only way to get
> containers to behave sensibly. Otherwise we'd end up with nonsense
> like:
>
x = float("nan")
x in [x]
> False
Why is that nonsense? I mean, why is it any more nonsense than
>>> x == x
False
Anyway
Steven D'Aprano :
> I simply don't care. They will try it, discover that tuples are not
> context managers, fix their code, and move on.
*Could* tuples (and lists and sequences) be context managers?
*Should* tuples (and lists and sequences) be context managers?
> I don't think that some vague
Tres Seaver :
> On 08/19/2014 01:43 PM, Ben Hoyt wrote:
>> Fair enough. I don't quite understand, though -- why is the "official
>> policy" to kill something that's "essential" on *nix?
>
> ISTM that the policy is based on a fantasy that "it looks like text to
> me in my use cases, so therefore it
Guido van Rossum :
> With my serious hat on, I would like to claim that *conceptually*
> filenames are most definitely text. Due to various historical
> accidents the UNIX system calls often encoded text as arguments, and
> we sometimes need to control that encoding.
Due to historical accidents,
"Martin v. Löwis" :
> I think the people defending the "Unix file names are just bytes" side
> often miss an important detail: displaying file names to the user, and
> allowing the user to enter file names.
The user interface is a real issue and needs to be addressed. It is
separate from the OS i
Nick Coghlan :
> Python 3 says it's *our* problem to deal with on behalf of our
> developers.
http://www.imdb.com/title/tt0120623/quotes?item=qt0353406>
Flik: I was just trying to help.
Mr. Soil: Then help us; *don't* help us.
Marko
___
Pyth
"Stephen J. Turnbull" :
> Just read as bytes and decode piecewise in one way or another. For
> Oleg's HTML case, there's a well-understood structure that can be used
> to determine retry points
HTML and XML are interesting examples since their encoding is initially
unknown:
Isaac Morland :
>> HTTP/1.1 200 OK
>> Content-Type: text/html; charset=ISO-8859-1
>>
>>
>>
>>
>>
>
> For HTML it's not quite so bad. According to the HTML 4 standard:
> [...]
>
> The Content-Type header takes precedence over a element. I
> thought I read once that the reason was to all
"R. David Murray" :
> The same problem existed in python2 if your goal was to produce a stream
> with a consistent encoding, but now python3 treats that as an error.
I have a different interpretation of the situation: as a rule, use byte
strings in Python3. Text strings are a special corner case
Paul Moore :
> Cool, in which case this sounds like a good plan. I have no particular
> opinion on whether there should be a global Python-level "don't check
> certificates" option, but I would suggest that the docs include a
> section explaining how a user can implement a
> "--no-check-certificat
Victor Stinner :
> Proposition
> ===
>
> If a system call fails with ``EINTR``, Python must call signal
> handlers: call ``PyErr_CheckSignals()``. If a signal handler raises
> an exception, the Python function fails with the exception.
> Otherwise, the system call is retried. If the syste
Victor Stinner :
> Sorry but I don't understand your remark. What is your problem with
> retrying syscall on EINTR?
The application will often want the EINTR return (exception) instead of
having the function resume on its own.
> Can you please elaborate? What do you mean by "get wrong"?
Proper
Victor Stinner :
> But I don't get you point. How does this PEP make the situation worse?
Did I say it would? I just wanted to make sure the system call
resumption doesn't become mandatory.
Haven't thought through what the exception raising technique would
entail. It might be perfectly ok apart
Ethan Furman :
> On 08/31/2014 02:19 PM, Marko Rauhamaa wrote:
>> The application will often want the EINTR return (exception) instead
>> of having the function resume on its own.
>
> Examples?
>
> As an ignorant person in this area, I do not know why I would ever
"R. David Murray" :
> PS: I recently switched from using selectors to using a timeout on a
> socket because in that particular application I could, and because
> reading a socket with a timeout handles EINTR (in recent python
> versions), whereas reading a non-blocking socket doesn't. Under the
>
Victor Stinner :
> No, it's the opposite. The PEP doesn't change the default behaviour of
> SIGINT: CTRL+C always interrupt the program.
Which raises an interesting question: what happens to the os.read()
return value if SIGINT is received?
Marko
___
Charles-François Natali :
>> Which raises an interesting question: what happens to the os.read()
>> return value if SIGINT is received?
>
> There's no return value, a KeywordInterrupt exception is raised.
> The PEP wouldn't change this behavior.
Slightly disconcerting... but I'm sure overriding S
"R. David Murray" :
> Windows. Enough said?
> [...]
> This should tell you just about everything you need to know about why
> we want to fix this problem so that things work cross platform.
I feel your pain. Well, not really; I just don't want my linux bliss to
be taken away.
Marko
___
"R. David Murray" :
> On Mon, 01 Sep 2014 14:15:52 +0300, Marko Rauhamaa wrote:
>> * Allow the application to react to signals immediately in the main
>>flow.
>
> You don't want to be writing your code in Python then. In Python you
> *never* g
Donald Stufft :
> My biggest problem with ``python3``, is what happens after 3.9. I know
> Guido doesn’t particularly like two digit version numbers and it’s
> been suggested on this list that instead of 3.10 we’re likely to move
> directly into 4.0 regardless of if it’s a “big” change or not.
py
Steven D'Aprano :
> Perhaps I'm missing something, but aren't there easier ways to attack
> os.system than the bash env vulnerability?
The main concern is the cases where you provide a service accessible
through an SSH login and try to sandbox the client with limited
functionality. SSH passes so
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