🌐 Mailman 3 March 2018 - Python-list - python.org

Python Challenge Online - 30 Questions
by Julien Carlier March 1, 2018

March 1, 2018

Hello, Cisco & Dimension Data organize a Python Challenge on EDITx. It is a good way to test your skills & have fun. -> https://editx.eu/it-challenge/python-challenge-2018-cisco-and-dimension-data Rules are simple: 15 minutes online, 30 questions & 3 jokers. Everyone is allowed to participate but only belgian residents can win the prizes. Do not hesitate to share it with people that might be interested. Feedbacks are welcome :) Regards, Julien -- Frankenstraat - Rue des Francs 79 1000 Brussels

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Re: Is there are good DRY fix for this painful design pattern?
by Gregory Ewing March 1, 2018

March 1, 2018

After this thread, the term "docstring" is never going to mean quite the same thing to me again. -- Greg

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Re: In Python2, does it need to wrap imp.find/load_module with imp_acquire/release_lock?
by Xiang Zhang March 1, 2018

March 1, 2018

On Wednesday, February 28, 2018 at 3:02:38 PM UTC+8, dieter wrote: > Xiang Zhang <zhangyangyu0614(a)gmail.com> writes: > > > Just like the title. It seems to me it is needed from the source code but codes in stdlib all doesn't do that. > > The "import" machinery uses locks of its own (to protect "sys.modules"). > > I assume that "load_module" will use those locks internally. > "find" might be considered to usually see quite a static situation; > should your file system be modified by concurrent threads, it might > be necessary that you use your own locks to protect against this. I know. But my confusion is that I can't confirm your assumption. I can't find where the import lock is acquired in its code path.

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Functions unnecessarily called in Python/pylifecycle.c:_Py_InitializeCore() ?
by Thomas Nyberg March 1, 2018

March 1, 2018

Hello, I was playing around with cpython and noticed the following. The `_PyFrame_Init()` and `PyByteArray_Init()` functions are called in these two locations: https://github.com/python/cpython/blob/master/Python/pylifecycle.c#L693-L694 https://github.com/python/cpython/blob/master/Python/pylifecycle.c#L699-L700 But here are their function definitions and they appear to do nothing: https://github.com/python/cpython/blob/master/Objects/frameobject.c#L555-L5… https://github.com/python/cpython/blob/master/Objects/bytearrayobject.c#L24… I can understand leaving the functions in the source for backwards-compatibility, but why are they still being called in `_Py_InitializeCore()`? Seems like it just adds noise for those new to the cpython internals. Is there some consistency doc that requires this or something? Maybe this isn't the right place to ask, but I'm not sure where is. Thanks for any enlightenment! Cheers, Thomas

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Re: RFC: Proposal: Deterministic Object Destruction
by Rick Johnson Feb. 28, 2018

Feb. 28, 2018

On Wednesday, February 28, 2018 at 5:50:53 PM UTC-6, Steven D'Aprano wrote: > On Wed, 28 Feb 2018 14:51:09 -0800, ooomzay wrote: > > > > [...] > > > > Specification > > ============= > > > > When the last reference to an object goes out of scope the > > intepreter must synchronously, in the thread that releases > > the last reference, invoke the object's __del__() method > > and then free the memory occupied by that object. > > What happens if the __del__ method recreates a reference to > the object? So make instantation of the object in its __del__ method an illegal op!

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Detection of ultrasonic side channels in mobile devices with Python?
by Etienne Robillard Feb. 28, 2018

Feb. 28, 2018

Hi, I would like to know if its possible to detect or decode ultrasonic signals in mobiles devices like Android with Python? For a introduction to ultrasonic tracking, see: https://www.wired.com/2016/11/block-ultrasonic-signals-didnt-know-tracking/ Thank you, Etienne -- Etienne Robillard tkadm30(a)yandex.com https://www.isotopesoftware.ca/

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Re: Detection of ultrasonic side channels in mobile devices with Python?
by Grant Edwards Feb. 28, 2018

Feb. 28, 2018

On 2018-03-01, Dennis Lee Bieber <wlfraed(a)ix.netcom.com> wrote: > The bandwidth normally used for voice grade telephone traffic is closer > to 6kHz (say 300Hz to 6.3kHz) Wow, that's pretty high -- where was that? Back when I was designing telephony electronics in US in the late 80's, POTS bandwidth was 3KHz: 300-3.3K. That same bandpass spec was used for the audio stages in the first couple generations of AMPS cellular mobile phones. The Codecs used in digital telephony (e.g. a T1 trunk) used 7-bit converts with 8KHz sampling, which means a cutoff frequency below 4KHz. -- Grant

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Problem: Need galileo running on debian wheezy
by Gene Heskett Feb. 28, 2018

Feb. 28, 2018

I know its supposed to be in the debian stretch repo's. I've been told to get a fitbit, but they don't support linux of any flavor, and that leaves galileo as the possible solution? So how should I proceed since the only stretch machine I have ATM is an arm64, aka a rock64. -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene>

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Re: Detection of ultrasonic side channels in mobile devices with Python?
by Rick Johnson Feb. 28, 2018

Feb. 28, 2018

On Wednesday, February 28, 2018 at 4:34:11 PM UTC-6, Etienne Robillard wrote: > A great number of studies have shown that ultrasonic > neuromodulation of the central nervous system can be > exploited via brain-computer interfaces... It is cutting > edge science however, and my knowledge on techniques for > activating human behavior by remote means is limited. I am > only an amateur scientist/programmer with no experience > whatsoever in Android or neuroscience. I doubt anyone in this group will have knowledge in such a high-tech experimental/theoretical field such as "remote behavior modification"? And even if someone did, i'm sure they'd wise enough to keep quiet about it. Because if such technology exists today, then it would have military applications, and thus, be highly classified. And, just as a thought experiment, if we imagined that -- somehow -- you attained this specialized knowledge, and you were _not_ already employed by one of the military labs -- oh boy! -- you would then become a threat to national security, and be hunted by every spy agency on the face of this planet. With that in mind, i think you're in waaaaay over your head. And perhaps you should apply a reversed transformation to your current vector path. > However, the possibility of ultrasonic side channels to be > exploited by a third-party remotely without the user > consent seem highly likely. I want to develop Python tools > to provide experimental evidences that Android may exploit > ultrasonic side channels to stimulate or impair the > auditory cortex of someone. That sounds malicious to me. Although, considering the abysmal state of music these days... sometimes i wish my smart phone _would_ impair my auditory cortex. > In other words, I plan to disclose the ability of the US > government to use mobile devices as psychoenergetics (non- > lethal) bioweapons. Why take the chance? Ditch the phone all together and live free! Who cares about the lemmings anyway. The worms have already ate into their brains. Even if you provide evidence proving your claims to be true, people (*AHEM*, "Sheeple") are so wedded to their smart phones that even *IF* smart phones caused chronic explosive diarrhea, i seriously doubt anyone would put their phone down for more than five minutes. We're talking about OCD on a _galactic_ scale here, my friend. In fact, smart phone users have become so OCD about their phones, that soon they plan to borrow the NRA's slogan (slightly modified, of course): 'From my *COLD*. *DEAD*. *BROWN*. *HAND*."

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Drinking from the fire-hose
by Steven D'Aprano Feb. 28, 2018

Feb. 28, 2018

Hey Chris, regretting writing that "Statement-Local Name Bindings" PEP yet? :-) I know *I'm* regretting that you wrote it, because this is the sort of language feature that has the potential to make Python significantly ugly and worse, and I'd like to have my say, but there's no way I have time to troll through 50+ and counting (in just 25 hours!) posts. -- Steve

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