Mailman 3 August 2015 - code-quality

Adding python function arguments related customized rule in pylint
by Ahirnish Pareek 31 Aug '15

31 Aug '15

Hi all, I want to add a customized check to my pylintrc file to check and report cases whenever I define a function in a python file like this: def foo( var1, name1=value, *args ): The problem that I want to deal with is that we should not have keyword arguments( *name1* ) before positional arguments( **args* ). Although the function can still be called by passing *name1* as positional argument but there would be no way to not specify *name1* but specify **args*. How can I add this check to pylintrc file? Thanks in advance! -- Regards, Ahirnish

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pylint + pony.orm
by Аня Свалова 26 Aug '15

26 Aug '15

Hi, I decided to check my project via pylint, but this check failed with error "Unexpected keyword argument 'field1' in constructor call (unexpected-keyword-arg)". What should I do to do to fix this error? ? In t he test project two files: __init __. py and test.p y . test.p y # coding: utf-8 from pony.orm import sql_debug, db_session, Database, Required db = Database() class MyClass(db.Entity): field1=Required(unicode) db.bind('sqlite', '/tmp/dns11.sqlite', create_db=True) db.generate_mapping(create_tables=True) with db_session: MyClass(field1='aaa') Regards, Anna.

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Pylint reports, is anyone using them?
by Claudiu Popa 24 Aug '15

24 Aug '15

Hello, For quite some time, since the very first 'Forget the past' commit I have access to, pylint had the ability of providing additional reports, such as Global evaluation, Messages by category, Statistics by type etc. For those of you who are unfamiliar with them, they look like this http://paste.openstack.org/show/421040/ pylint provides an easy way to disable them, by using the --reports flag, as in `--reports=y|n`. After using pylint for some time, they're started to feel useless for me and I'm always disabling them when running pylint. They don't provide that much value, except maybe scaring new users with all sorts of numbers, percentages and negative scores (yes, the default formula allows the global evaluation score to become negative). For pylint users, what do you think about the removal of these reports from pylint? Would it cause problems for you? Are these reports in any sense useful for you? If there's no negative push-back, we'll go through the normal deprecation procedures, so they won't be removed until two releases for now or until Pylint 2.0. As a benefit, we'll get rid of a lot of code that no one is happy to maintain and the maintainers can focus on developing the analysis capabilities instead. Thank you, Claudiu

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Introducing Rene Zhang
by Daniel Balparda (梅巴達) 22 Aug '15

22 Aug '15

Hi, Rene Zhang is doing his internship at Google, and has helped debug some parts of our internal pylint stack. Doing this he has uncovered some issues for which he will be sending in some patches he developed at Google. Thank you, Daniel ι══ι══ι══ι══ι══ι══ι══ι══ι══ι══ι══ι══ι══ι══ι══ι══ι══ι══ι══ι *Daniel Balparda de Carvalho* 梅巴達 <balparda(a)google.com> Python Team, Google US-MTV-CL2 3K5B, +1-650-933-8587

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Re: [code-quality] Pylint reports, is anyone using them?
by Cara 19 Aug '15

19 Aug '15

I use some of the reports some of the time. The external dependencies report is by far the most important for me, my typical use is for analyzing packages to figure out what blocks a given package from running on PyPy or Python 3. I haven't been able to find a good replacement, so I'd be sad to see it go. I sometimes use the raw metrics to get a picture of how much actual code there is in messy projects, my own or others'. Duplicated lines is something I find useful mostly in hunting for duplication in code written by other people I need to refactor. I could probably write scripts to replace this functionality, though, or use other tools. The rest I can't ever remember using. The numeric evaluation is actively misleading, which I think is reason enough to eliminate it. Cara

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flake8 on windows
by Mark Summerfield 05 Aug '15

05 Aug '15

Hi, According to the flake8 docs you can set your preferences in ~/.config/flake8 on Linux -- and this works fine. But the docs don't mention Windows. I tried \User\mark\ and I tried the root of my Python project (as flake8, as tox.ini, and as setup.cfg), but nothing seemed to work. Best wishes, -- Mark Summerfield, Qtrac Ltd. DiffPDFc windows command line PDF comparison tool http://www.qtrac.eu/diffpdfc.html

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flake8 - finer control
by Mark Summerfield 04 Aug '15

04 Aug '15

Hi, I've recently started using flake8 and rather like it. However, there are some cases where I want to turn off particular warnings per-file. For example, in one .py file I have many lines like this: if DEBUG: print(...) Using # noqa on these doesn't work. What I'd like to do is put at the top of this file: # flake8: ignore = E701 since normally I do want this warning. I'm using Debian stable: $ py3 -m flake8 --version 2.2.2 (pep8: 1.4.6, pyflakes: 0.8.1, mccabe: 0.2.1) CPython 3.4.3+ on Linux Best wishes, -- Mark Summerfield, Qtrac Ltd. "Python in Practice" - Dr Dobbs JOLT best book award winner http://www.qtrac.eu/pipbook.html

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Python source analyzer which is able to detect TypeError when using `in` with dict.get()
by Александр Чекунков 01 Aug '15

01 Aug '15

Hi there! Recently I submitted such piece of code to one of my projects: if 'text' in d.get('a'): # do something Obviously that was expected to be something like: if 'text' in d.get('a', ''): # do something because .get() might return None, and checking if something is contained in None gives you TypeError. Maybe it was too late, I was trying to finish this piece of code asap and I expected flakes8 to detect this for me, so when PR became green I merged it. When I realized this piece of code is buggy it was too late :) As I don't want to repeat this mistake I decided to take measures. As I was using flakes8 at the moment and it didn't notice this bug - I thought "Hm, maybe I should use some better tool, maybe pyflakes is too simple to catch that". So I tried pylint and prospector. They do almost everything, I believe both tools can bring you coffee in the bed. But they cannot detect such a simple error. No success. And that makes me really unhappy. Do you guys know any Python code analyzer which is able to catch such problem? Is there a chance this can be implemented in pyflakes? If so - should I create bug on https://bugs.launchpad.net/pyflakes/+filebug? -- Best regards, Alexander Chekunkov

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