Mailman 3 May 2018 - code-quality

Pylint website down
by C.A.M. Gerlach 31 May '18

31 May '18

Hello, Just wanted to drop you a line that the Pylint website <http://www.pylint.org/> is down, as I can see locally, on our CIs (I initially noticed it when our docs build failed due to sphinx linkcheck detecting the pylint links as broken) and on isup.me. Also, as it seems you have a working HTTPS implementation it would be prudent to change your published links over to that. Thanks, *C.A.M. Gerlach*

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Is there a tool which will catch this sort of mistake?
by Skip Montanaro 18 May '18

18 May '18

I stumbled on this in a colleague's code today: class MyClass(object): def __init__(self, me): self._name = me @property def name(self): return self.name Running this code would find the bug very quickly (good argument for unit tests). Still, it would be nice if some static analysis tool could identify that the return value would produce infinite recursion. Neither pylint nor pyflakes complained. I'm not asking for a solution to the halting problem. Just a realization that you are inside a property method and returning that item. I'd be happy for a false positive or two. I'm well-steeped in use of # pylint: disable=... One more in rare cases wouldn't be a big deal. (I'd be happy to try and write a checker for pylint. Last time I looked though a few years ago, I lacked enough knowledge of the code base to knock something out.) Skip Montanaro

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Pyreverse on multiple modules
by Rich Shepard 14 May '18

14 May '18

Pylint-1.7.1 is installed here and runs with python-3.6.5. I have a directory with 5 modules (not my project) and I want to understand the logic using pyreverse. It's not working for me and the pyreverse web page hasn't helped me learn how to use it successfully. The directory contains these modules: controller.py, main.py, addModRecord.py, commonDlgs.py, model.py Invoking pyreverse yields a ValueError: $ pyreverse -o png -f ALL -cAS -p ./main.py addModRecord.py commonDlgs.py controller.py model.py parsing addModRecord.py... parsing commonDlgs.py... parsing controller.py... parsing model.py... Traceback (most recent call last): File "/usr/bin/pyreverse", line 11, in <module> load_entry_point('pylint==1.7.1', 'console_scripts', 'pyreverse')() File "/usr/lib/python3.6/site-packages/pylint/__init__.py", line 24, in run_pyreverse Run(sys.argv[1:]) File "/usr/lib/python3.6/site-packages/pylint/pyreverse/main.py", line 110, in __init__ sys.exit(self.run(args)) File "/usr/lib/python3.6/site-packages/pylint/pyreverse/main.py", line 125, in run diadefs = handler.get_diadefs(project, linker) File "/usr/lib/python3.6/site-packages/pylint/pyreverse/diadefslib.py", line 223, in get_diadefs diagrams.append(generator.class_diagram(project, klass)) File "/usr/lib/python3.6/site-packages/pylint/pyreverse/diadefslib.py", line 185, in class_diagram module, klass = klass.rsplit('.', 1) ValueError: not enough values to unpack (expected 2, got 1) Pyreverse is looking at ../pyreverse/main.py rather than the main.py module in the code I want analyzed. I need to learn how to write the command line so pyreverse shows me the relationships among modules, classes, and methods, and I've not found docs or a web site discussion that shows me how to do this. Regards, Rich

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Libraries and Standardization
by Ian Stapleton Cordasco 13 May '18

13 May '18

Hi all, tl;dr: Two of us think it'd be good to collaborate even more and standardize on more things between projects. We'd like your feedback. So Claudiu and I had some time to chat while we were at PyCon. I think much of the discussion was spurred by https://github.com/PyCQA/meta/issues/25 and I think we came to some solid agreement on things we'd like to see the PyCQA become and do. We covered two main topics: 1. The joking name that I chose for our tiny organization is causing confusion for others. For example, we have several tools that we maintain that contribute to improving and maintaining people's code quality. However, people often see two or more of those tools as exclusive or as conflicting (e.g., pylint and flake8, pylint and pycodestyle) 2. There are a lots of things that we all do similarly but just slightly differently. It would be *fantastic* for our users if they didn't have to learn 15 ways of doing things (I'm exaggerating of course). An Authority should be an Authority ... or at least act as something approximating a single unit The idea here is that we should do our best to explain to users that there's no animosity between pylint and flake8. In fact, Flake8 runs Pylint everytime we run our tests. Just like flake8 runs itself against its own code base as well as Pylint, we should have a cohesive story to users. There's lots of junk on the internet about why to use one over the other. I proposed that we might want to sell users on an approach like so: If you've never used one of these tools before, start small. Flake8 seems to be slightly easier for folks to get started with. Let's suggest that as a first step kind of like sticking your toes in the water to determine the temperature. Once you're happy with that and you want something a little more advanced and powerful, start using Pylint. Continue using both. They overlap but they don't entirely coincide. You learned A, I learned B, they learned C, let's all learn from each other The next step would be aggregating everyone's learnings. Pylint has been around for nearly 2 decades (if I remember correctly) and Flake8 has been around for almost a decade (maybe it's been a decade? I don't even know anymore). We have more and more tools. We all use configuration files and we all have slightly different behaviour with respect to how we handle them, find them, etc. We could all standardize and document a standard for the organization. In my opinion, that standard should be pyproject.toml (c.f., https://snarky.ca/clarifying-pep-518/). INI + ConfigParser is terrible. TOML, while I don't like the fact that it hasn't been properly specified or standardized, is at least a bit more flexible. Further, the packaging community has chosen this and is unifying on it. The PEP even specifically suggests people being able to use sections named "tool.pylint" or "tool.flake8". It looks close enough to INI that I don't think it'd be a pain for users to migrate. I think as we make this migration, we should also consider migrating to a simpler configuration structure - namely eliminating User configuration (either in $HOME or in $XDG_CONFIG) as well as system level configuration. It makes sense that if we're standardizing on all of this for users, we can also build libraries for standardizing things in the org: ideas of some low hanging-fruit: - Multiprocessing (-j/--jobs for concurrency) - Configuration file management (e.g., format, parsing, locating, and merging) - Naming error codes (e.g., standardizing on how pylint names things) - Standardizing on configurability of running versus ignored checks - And a few others Naturally, this is just the things we discussed and we're by no means the people making final decisions here, so we'd like you to weigh in. Cheers, Ian

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Pylint: super-init-not-called when ancestor class is abstract
by Dunatotatos 11 May '18

11 May '18

Hi all, Please CC-me in all answers to this message, I am not subscribed to the mailing list. If I implement an abstract class in Python: >>> class Ancestor(object): >>> def __init__(self): >>> raise NotImplementedError Then write a child class: >>> class Child(Ancestor): >>> def __init__(self): >>> return self Pylint finds a warning W0231 super-init-not-called on the definition of Child.__init__. IMHO, it should not be the case, as a Child class will never call the constructor of the ancestor. Am I missing something? Best, Duna

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About issue #352
by Mehtab Zafar 07 May '18

07 May '18

Hi, I am GSoC student under Kodi(XBMC) org. And we have an addon-checker tool <https://github.com/xbmc/addon-check> that checks for addons submitted. I will be using pylint for implementing some checks into our code base. Now the problem we are facing is that if the folder is missing __init__.py file pylint does run on those folders. Now this problem is know under issue #352 <https://github.com/PyCQA/pylint/issues/352> but no work is been done on it since last year. so I was willing to know that Are you guys planning to solve the issue any time soon ? Thank you

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pylint html replacement options
by Mark E. Hamilton 03 May '18

03 May '18

Hi, We recently tried to upgrade from pylint-1.5 to pylint-1.8 because of some of the new features we wanted. Unfortunately, this upgrade failed because we use the html output feature, and have for some years, and that is now gone. Is there a recommended solution for generating HTML from the results other than 'write it yourself', as the documentation seems to indicate? Some sort of converter that will generate the same style report as before for us? I tried pylint-json2html, but couldn't get that to work. -- ---------------- Mark E. Hamilton Engineering Sciences Center Senior Member of Technical Staff Sandia National Laboratories 505-844-7666

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code-quality May 2018