🌐 Mailman 3 April 2021 - Python-list - python.org

Re: Not found in the documentation
by elas tica April 28, 2021

April 28, 2021

> The *Language Reference* is designed to be much more formally defined, and > favors correctness and completeness over being easy to access by less > technical readers. > Not really my opinion. Language Reference (LR) style is still written in a conversational style, giving examples instead of definition. Typically consider this paragraph from the LR: ------------ begin excerpt ------- The value of some objects can change. Objects whose value can change are said to be mutable; objects whose value is unchangeable once they are created are called immutable. (The value of an immutable container object that contains a reference to a mutable object can change when the latter’s value is changed; however the container is still considered immutable, because the collection of objects it contains cannot be changed. So, immutability is not strictly the same as having an unchangeable value, it is more subtle.) An object’s mutability is determined by its type; for instance, numbers, strings and tuples are immutable, while dictionaries and lists are mutable. ------------ end excerpt ------- The explanations inside the parenthensis is a by-the-way explanation, a mark of conversional style not to say tutorial style. Before parenthensis, we are talking about value of **any kind** of object and changeability in general. Now, the parenthensis is refering to immutable container as an illustration. The same for last sentence : "for instance ..." The problem is that the documentation doesn't define what the value of an object is, what means changing the value. The documentation doesn't explain **how** mutability is determined by the type of the object. By the way, how the docs define a container? Answer: "Some objects contain references to other objects; these are called containers". So to summarize : "a container contains", what a great definition! You said that LR is designed to be much more formally defined, and favors correctness and completeness. Good, so can you answer this question after reading the LR : what is a "token"? Did't find a definition. Is the "is not" operator a token? > There's an argument to be made that the description of the expected > __str__() behavior of ints is not easy to find within section 3 of the > language reference, and I imagine that a reasonable proposed change to this > wording would be considered favourably. (python is accepting pull requests > when they pass review :). > A drop in the ocean, sorry but Python docs are irrecoverable.

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EuroPython 2021: Speaker Mentorship Program
by M.-A. Lemburg April 28, 2021

April 28, 2021

In the EuroPython community, diversity and inclusion are one of our core values. Therefore, we are launching a Speaker Mentorship Program in this year's edition. * EuroPython 2021 Speaker Mentorship Program * https://ep2021.europython.eu/events/call-for-proposals/ We know how tough it is to prepare for a talk, find & organize the right content around the topic and more so when it's the first time. So what could be better than getting guidance and support from within the community itself. By means of this program, we would like to bridge the gap between a developing and experienced speaker. Hence, we are looking for mentors and mentees to sign up. Please check our CFP page for full details: https://ep2021.europython.eu/events/call-for-proposals/ Applications are open until Friday, April 30, 2021. Quick Summary ------------- EuroPython 2021 will be run online from July 26 - August 1: - Two workshop/training days (July 26 - 27) - Three conference days (July 28 - 30) - Two sprint days (July 31 - August 1) The sessions will be scheduled to ensure they are also accessible for those in the Asian and Americas time zones. Help spread the word -------------------- Please help us spread this message by sharing it on your social networks as widely as possible. Thank you ! Link to the blog post: https://blog.europython.eu/europython-2021-speaker-mentorship-program/ Tweet: https://twitter.com/europython/status/1387004298211602433 Enjoy, -- EuroPython 2021 Team https://www.europython-society.org/

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Re: Not found in the documentation
by elas tica April 28, 2021

April 28, 2021

Le mardi 27 avril 2021 à 01:44:04 UTC+2, Paul Bryan a écrit : > From https://docs.python.org/3/reference/datamodel.html#the-standard-type-hierar… > : > > > The string representations of the numeric classes, computed > > by__repr__() and __str__(), have the following properties: > > * They are valid numeric literals which, when passed to their > > class constructor, produce an object having the value of the > > original numeric. > > * The representation is in base 10, when possible. I realize that these basic informations have been very recently added to the Language Reference document as they are missing from the 3.8.5 version (July 2020) as you can check here: https://docs.python.org/release/3.8.5/reference/datamodel.html#index-8

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Re: Ad-hoc SQL query builder for Python3?
by Robert Latest April 27, 2021

April 27, 2021

Rich Shepard wrote: > For those interested I've found a couple of possibilities: PyPika and > SQLbuilder. I'll be looking deeply into them to learn their capabilities. In case nobody mentioned it before, don't forget to take a look at SQLAlchemy. The object-relational-mapper (ORM) creates a 1:1 mapping of Python objects to SQL table rows. -- robert

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Re: Not found in the documentation
by elas tica April 27, 2021

April 27, 2021

> However, in this case, the general information in the docs is > absolutely sufficient, and the basic principle that the repr should > (where possible) be a valid literal should explain what's needed. This is a subjective statement. Recall: explicit is better implicit. Alas, many parts of the Python docs are written in a conversational style, full of implicit and fuzzy meanings.

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Re: Not found in the documentation
by elas tica April 27, 2021

April 27, 2021

> Python has this thing called interactive mode that makes it possible to > discover answers even faster than looking in the docs To go further : Python has this thing called source code that makes it possible to discover answers even faster than looking in the docs

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Re: Not found in the documentation
by elas tica April 27, 2021

April 27, 2021

Le mardi 27 avril 2021 à 01:44:04 UTC+2, Paul Bryan a écrit : > From https://docs.python.org/3/reference/datamodel.html#the-standard-type-hierar… > : > Thanks for the reference. I was expecting to find this information in the Built-in Types section from the PSL documentation. The representation returned by str over a complex number is not stated. The same for fraction objects. All the docstrinds are meaningless, showing : __str__(self) str(self) (END) not very informative.

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Not found in the documentation
by elas tica April 27, 2021

April 27, 2021

Python documentation doesn't seem to mention anywhere what is the str value of an int: is it right? the same for float, Fraction, complex, etc? Not worth to be documented? Perphaps str(42) returns "forty two" or "XLII" or "101010" ...

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Re: async watch directory for new files
by Zoran April 26, 2021

April 26, 2021

On Saturday, 24 April 2021 at 18:52:24 UTC+2, Dieter Maurer wrote: > Zoran wrote at 2021-4-23 14:31 -0700: > >I need to watch for new files in directory, and when it shows up, I should create async task with file's full path for it, and wait for new file. > > > >If anyone here used a library for such task, please share which one. > The solution likely depends on the OS you are using. > > For Linux, `inotify` informs applications about file system changes. > PyPI contains a binding for it -- with identical name. As I can see https://pypi.org/project/inotify/ is not asyncio frendly. Whatever I use, it should be asynchronous. Final OS is linux (Centos 7), but I am doing development on Windows 10 machine, so it would be nice if I have something that works on both.

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"py.ini" question
by Gisle Vanem April 26, 2021

April 26, 2021

I have a question about the Python launcher; c:\Windows\py.exe and the py.ini file. I have both Python 3.6 (32-bit) and Python 3.8 (64-bit) installed. And I have a 'c:\Users\Gisle\AppData\Local\py.ini' with this only: [defaults] python=3.6 A copy of this is also in 'c:\Windows\py.ini'. So when I do a: py -3 -c "import sys; print(sys.version)" I would assume a "3.6..." would be printed. But no, py.exe chooses to run my newest Python 3.8: 3.8.9 (default, Apr 13 2021, 15:54:59) [GCC 10.2.0 64 bit (AMD64)] Only when I do 'py -3.6 -c ...', I get what I'd expect. So is a 'py.ini' and the '[defaults]' simply ignored or is my syntax wrong? -- --gv

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