Mailman 3 January 2018 - Python-ideas

Make functions, methods and descriptor types living in the types module
by Serhiy Storchaka Jan. 13, 2018

Jan. 13, 2018

Currently the classes of functions (implemented in Python and builtin), methods, and different type of descriptors, generators, etc have the __module__ attribute equal to "builtins" and the name that can't be used for accessing the class. >>> def f(): pass ... >>> type(f) <class 'function'> >>> type(f).__module__ 'builtins' >>> type(f).__name__ 'function' >>> type(f).__qualname__ 'function' >>> import builtins >>> … [View More]

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Re: [Python-ideas] Support WHATWG versions of legacy encodings
by Nathaniel Smith Jan. 12, 2018

Jan. 12, 2018

On Jan 11, 2018 4:05 AM, "Antoine Pitrou" <solipsis(a)pitrou.net> wrote: Define "widely used". If web-XXX is a superset of windows-XXX, then perhaps web-XXX is "used" in the sense of "used to decode valid windows-XXX data" (but windows-XXX could be used just as well to decode the same data). The question is rather: how often does web-XXX mojibake happen? We're well in the 2010s now and you'd hope that mojibake doesn't happen as often as it used to in, e.g., 1998. I'm not an expert … [View More]

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Syntax to import modules before running command from the command line
by Steve Barnes Jan. 11, 2018

Jan. 11, 2018

Currently invoking `python -c "some;separated;set of commands;"` will, if you need to use any library functions, require one or more import somelib; sections in the execution string. This results in rather complex "one liners". On the other hand `python -m somelib` will load somelib and attempt to execute its `__main__()` or give an error if there isn't one. What I would like to suggest is a mechanism to pre-load libraries before evaluating the -c option as this would allow the use of … [View More]

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Re: [Python-ideas] Allow to compile debug extension against releasePython in Windows
by Ivan Pozdeev Jan. 10, 2018

Jan. 10, 2018

On 08.01.2018 0:11, Steve Dower wrote: > > It’s not a good idea. You end up with two different C runtimes in > memory that cannot communicate, and many things will not work properly. > > If you compile your debug build extension with the non-debug CRT (/MD > rather than /MDd) you will lose asserts, but otherwise it will work > fine and the quoted code picks the release lib. > Distutils' designers seem to have thought differently. Whether the extension is linked … [View More]against pythonxx_d.lib is governed by the --debug switch to the `build' command rather than the type of the running Python. Compiler optimization flags are inserted according to it, too. As a consequence, * I cannot install an extension into debug Python at all 'cuz `bdist_*' and `install' commands don't support --debug and invoke `debug' internally without it. * Neither can I compile an extension for release Python without optimizations. I'm at a loss here. Either I'm missing something, or with the current build system, it's impossible to debug extensions! > > Or if you like, when you install Python 3.5 or later there are > advanced options to install debug symbols and binaries. You can use a > proper debug build against the debug binaries (python_d.exe). > > Cheers, > > Steve > > Top-posted from my Windows phone > > *From: *Ivan Pozdeev via Python-ideas <mailto:python-ideas@python.org> > *Sent: *Saturday, December 30, 2017 13:01 > *To: *python-ideas(a)python.org <mailto:python-ideas@python.org> > *Subject: *[Python-ideas] Allow to compile debug extension against > releasePython in Windows > > The Windows version of pyconfig.h has the following construct: > > if defined(_DEBUG) > > pragma comment(lib,"python37_d.lib") > > elif defined(Py_LIMITED_API) > > pragma comment(lib,"python3.lib") > > else > > pragma comment(lib,"python37.lib") > > endif /* _DEBUG */ > > which fails the compilation of a debug version of an extension. Making > > debugging it... difficult. > > Perhaps we could define some other constant? > > I'm not sure whether such compilation is a good idea in general, so > > asking here at first. > > -- > > Regards, > > Ivan > > _______________________________________________ > > Python-ideas mailing list > > Python-ideas(a)python.org > > https://mail.python.org/mailman/listinfo/python-ideas > > Code of Conduct: http://python.org/psf/codeofconduct/ > -- Regards, Ivan [View Less]

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pdb to support running modules
by Mario Corchero Jan. 10, 2018

Jan. 10, 2018

Hello All, Since PEP 338 <http://www.python.org/dev/peps/pep-0338/> we can run python modules as a script via `python -m module_name` but there is no way to run pdb on those (AFAIK). The proposal is to add a new argument "-m" to the pdb module to allow users to run `python -m pdb -m my_module_name` This is especially useful when working on cli tools that use entrypoints in setup.py, as there is no other way to run them. I have a possible implementation here https://github.com/python/… [View More]

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make Connections iterable
by Oscar Smith Jan. 9, 2018

Jan. 9, 2018

I am currently working on a program where it would be really useful if a connection had a __next__ method, because then it would be much easier to iterate over. It would just be an alias to recv, but would allow you to do things like merging the results of connections using heapq.merge that currently are highly non-trivial to accomplish. Is there a reason this API isn't supported? Oscar Smith

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Re: [Python-ideas] make Connections iterable
by Amit Green Jan. 9, 2018

Jan. 9, 2018

On Mon, Jan 8, 2018 at 10:34 PM, Nick Coghlan <ncoghlan(a)gmail.com> wrote > It could be useful to include a recipe in the documentation that shows a > generator with suitable error handling (taking the generic connection > errors and adapting them to app specific ones) while also showing how to > adapt the connection to the iterator protocol, though. > Agreed +1. This would be great for three reasons: - Error handling should be as close to the source of errors as … [View More]

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Re: [Python-ideas] [Python-Dev] subprocess not escaping "^" on Windows
by Chris Angelico Jan. 8, 2018

Jan. 8, 2018

Redirecting this part of the conversation to python-ideas. On Mon, Jan 8, 2018 at 3:17 AM, Christian Tismer <tismer(a)stackless.com> wrote: > As a side note: In most cases where shell=True is found, people > seem to need evaluation of the PATH variable. To my understanding, > >>>> from subprocess import call >>>> call(("ls",)) > > works in Linux, but (with dir) not in Windows. But that is misleading > because "dir" is a builtin command but "ls" … [View More]

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Allow to compile debug extension against release Python in Windows
by Ivan Pozdeev Jan. 7, 2018

Jan. 7, 2018

The Windows version of pyconfig.h has the following construct: if defined(_DEBUG) pragma comment(lib,"python37_d.lib") elif defined(Py_LIMITED_API) pragma comment(lib,"python3.lib") else pragma comment(lib,"python37.lib") endif /* … [View More]

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Add an UML class diagram to the collections.abc module documentation
by Yahya Abou 'Imran Jan. 5, 2018

Jan. 5, 2018

We can find very usefull class diagramm to understand the hierarchy of the builtin Collection abstract class and interface in java. Some examples: http://www.falkhausen.de/Java-8/java.util/Collection-Hierarchy-simple.html http://www.falkhausen.de/Java-8/java.util/Collection-List.html But when I search about python's ABC, The more detailed I can find are those from the book of Luciano Ramalho Fluent Python: https://goo.gl/images/8JGjvM https://goo.gl/images/6xZqcA (I think they're done with … [View More]

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a set of enum.Enum values rather than the construction of bit-sets as the "norm"?
by Paddy3118 Jan. 3, 2018

Jan. 3, 2018

Maybe it is time to deemphasize the creation and passing of what is, in effect, bit-sets <https://en.wikipedia.org/wiki/Bit_array>as a single argument, and instead promote the passing of a set of members of an enum.Enum <https://docs.python.org/3/library/enum.html> constants. Thi comes about because someone wrote a description, (since deleted), of constructing bit-sets to use in passing flags to, for example, the re.compile <https://docs.python.org/3/library/re.html#re.… [View More]

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