Mailman 3 March 2019 - pytest-dev

enhancing the assertion rewriting experience with custom integration/workflows
by Ronny Pfannschmidt July 29, 2019

July 29, 2019

Hi everyone, at a project at work which integrates pytest we did build a custom workflow around invoking tests and pytest. This in turn triggers a lot of warnings from the assertion rewriter about things that have been already imported. at first glance fixing this seems rather problematic, as the configuration of the assertion rewriting is deeply bound to the pytest configuration and it seems we cant do something simple and crude like letting a pth file fix the issue. i believe opening up the hooking system could be best done by moving it to a package with some sort of singleton control anyway - then pytest would be just a consumer of that api enabling if not enabled and push in its own "import roots". i'd like ot hear other impressions and ideas on this as well. -- Ronny

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pytest 4.4 released!
by Bruno Oliveira March 31, 2019

March 31, 2019

The pytest team is proud to announce the 4.4.0 release! pytest is a mature Python testing tool with more than a 2000 tests against itself, passing on many different interpreters and platforms. This release contains a number of bugs fixes and improvements, so users are encouraged to take a look at the CHANGELOG: https://docs.pytest.org/en/latest/changelog.html For complete documentation, please visit: https://docs.pytest.org/en/latest/ As usual, you can upgrade from pypi via: pip install -U pytest Thanks to all who contributed to this release, among them: * Anthony Sottile * ApaDoctor * Bernhard M. Wiedemann * Brian Skinn * Bruno Oliveira * Daniel Hahler * Gary Tyler * Jeong YunWon * Miro Hrončok * Takafumi Arakaki * henrykironde * smheidrich Happy testing, The Pytest Development Team

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Re: [pytest-dev] decorators and signature-preserving wrappers
by Sylvain MARIE March 13, 2019

March 13, 2019

Hi Harry, Thanks for your email ! That’s exactly what I do when you turn the “enable_introspection” flag on, but frankly I am not at all satisfied with my implementation today: it does not work from iPython/jupyter, and does not seem to work on classes either because the inspect.stack() that I am relying on does not seem to have the same behavior for functions and classes, in particular classes that have nested methods. You can have more details about this hack in the `disambiguate_using_introspection` method: https://github.com/smarie/python-decopatch/blob/master/decopatch/utils_disa… Kind regards Sylvain De : Harry Percival <harry.percival(a)gmail.com> Envoyé : mardi 12 mars 2019 15:04 À : Sylvain MARIE <sylvain.marie(a)se.com> Cc : pytest-dev(a)python.org Objet : Re: [pytest-dev] decorators and signature-preserving wrappers [External email: Use caution with links and attachments] ________________________________ fascinating. re the last suggestion in your pep, inspect.is_in_decorator_stack, I don't have much experience of inspect, but couldn't you build a hacky version of that already by, I don't know, looking at the source of decorator arguments and parsing it for @s or something? On Tue, 12 Mar 2019, 09:44 Sylvain MARIE via pytest-dev, <pytest-dev(a)python.org<mailto:pytest-dev@python.org>> wrote: (wrong title in previous email, sorry) Dear pytest enthusiasts, This is not pytest per se but quite low-level python so you may find it interesting also for pytest, that has many decorators. -- Writing python decorators is quite a tideous process, in particular when you wish to add arguments, and in particular in two cases : all optional arguments, and one mandatory argument. Indeed in these two cases there is a need to disambiguate between no-parenthesis and with-parenthesis usage. After having struggled with this pattern for two years in various open source and industrial projects, I ended up writing a library to hopefully solve this once and for all: https://smarie.github.io/python-decopatch/<https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsmarie.g…> . It is extensively tested (203 tests) against many combinations of signature/calls. I would gladly appreciate any feedback ! Please note that there is a "PEP proposal draft" in the project page because I belive that the best a library can do will always be a poor workaround, where the interpreter or stdlib could really fix it properly. Sorry for not providing too much implementation details in that page, my knowledge of the python interpreter is unfortunately quite limited. -- Finally there is an additional topic around decorators : people tend to believe that decorators and function wrappers are the same, which is absolutely not the case. I used the famous `decorator` lib in many projects but I was not satisfied because it was solving both issues at the same time, maintaining the confusion. I therefore proposed https://smarie.github.io/python-makefun/<https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsmarie.g…> . In particular it provides an equivalent of `(a)functools.wraps` that is truly signature-preserving (based on the same recipe than `decorator`). Once again, any feedback would be gladly appreciated ! Kind regards -- Sylvain De : pytest-dev <pytest-dev-bounces+sylvain.marie=se.com(a)python.org<mailto:pytest-dev-bounces+sylvain.marie=se.com@python.org>> De la part de Guilherme Zagatti Envoyé : vendredi 8 mars 2019 17:42 À : pytest-dev(a)python.org<mailto:pytest-dev@python.org> Objet : [pytest-dev] pytest-airflow plugin [External email: Use caution with links and attachments] ________________________________ Dear Pytest Development Community, My name is Guilherme Zagatti. I am a developer at Flowminder, an award winning social-enterprise especializing in the use of Big Data for international development. We are big fans of pytest. We needed to integrate pytest with Airflow to develop data quality assurance tests before ingesting data to our databases. Therefore we created the pytest-airflow pluging. We just made it available to pypi<https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpypi.org…> and open sourced in Github<https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.c…>. It would be great to receive feedback from the pytest community and your suggestions on how to best promote the plugin to other users. I am available to provide further details on the plugin. In the meanwhile, I have made available an architecture documentation<https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.c…> that contains a primer on pytest and detailed explanation of the plugin. Perhaps the contents of this document is of interest to the pytest community more generally. Feel free to provide comments and share more widely. Again, very-well done for maintaining pytest. Best, Guilherme Zagatti ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. ______________________________________________________________________ _______________________________________________ pytest-dev mailing list pytest-dev(a)python.org<mailto:pytest-dev@python.org> https://mail.python.org/mailman/listinfo/pytest-dev<https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fmail.pyt…> -- -- Harry Percival +44 78877 02511 ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. ______________________________________________________________________

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pytest 4.3.1 bug fix release
by Bruno Oliveira March 12, 2019

March 12, 2019

Hi everyone, pytest 4.3.1 has just been released to PyPI. This is a bug-fix release, being a drop-in replacement. To upgrade:: pip install --upgrade pytest The full changelog is available at https://docs.pytest.org/en/latest/changelog.html. Thanks to all who contributed to this release, among them: * Andras Mitzki * Anthony Sottile * Bruno Oliveira * Daniel Hahler * Danilo Horta * Grygorii Iermolenko * Jeff Hale * Kyle Altendorf * Stephan Hoyer * Zac Hatfield-Dodds * Zac-HD * songbowen Happy testing, The pytest Development Team

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decorators and signature-preserving wrappers
by Sylvain MARIE March 12, 2019

March 12, 2019

(wrong title in previous email, sorry) Dear pytest enthusiasts, This is not pytest per se but quite low-level python so you may find it interesting also for pytest, that has many decorators. -- Writing python decorators is quite a tideous process, in particular when you wish to add arguments, and in particular in two cases : all optional arguments, and one mandatory argument. Indeed in these two cases there is a need to disambiguate between no-parenthesis and with-parenthesis usage. After having struggled with this pattern for two years in various open source and industrial projects, I ended up writing a library to hopefully solve this once and for all: https://smarie.github.io/python-decopatch/<https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsmarie.g…> . It is extensively tested (203 tests) against many combinations of signature/calls. I would gladly appreciate any feedback ! Please note that there is a "PEP proposal draft" in the project page because I belive that the best a library can do will always be a poor workaround, where the interpreter or stdlib could really fix it properly. Sorry for not providing too much implementation details in that page, my knowledge of the python interpreter is unfortunately quite limited. -- Finally there is an additional topic around decorators : people tend to believe that decorators and function wrappers are the same, which is absolutely not the case. I used the famous `decorator` lib in many projects but I was not satisfied because it was solving both issues at the same time, maintaining the confusion. I therefore proposed https://smarie.github.io/python-makefun/<https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsmarie.g…> . In particular it provides an equivalent of `(a)functools.wraps` that is truly signature-preserving (based on the same recipe than `decorator`). Once again, any feedback would be gladly appreciated ! Kind regards -- Sylvain De : pytest-dev <pytest-dev-bounces+sylvain.marie=se.com(a)python.org<mailto:pytest-dev-bounces+sylvain.marie=se.com@python.org>> De la part de Guilherme Zagatti Envoyé : vendredi 8 mars 2019 17:42 À : pytest-dev(a)python.org<mailto:pytest-dev@python.org> Objet : [pytest-dev] pytest-airflow plugin [External email: Use caution with links and attachments] ________________________________ Dear Pytest Development Community, My name is Guilherme Zagatti. I am a developer at Flowminder, an award winning social-enterprise especializing in the use of Big Data for international development. We are big fans of pytest. We needed to integrate pytest with Airflow to develop data quality assurance tests before ingesting data to our databases. Therefore we created the pytest-airflow pluging. We just made it available to pypi<https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpypi.org…> and open sourced in Github<https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.c…>. It would be great to receive feedback from the pytest community and your suggestions on how to best promote the plugin to other users. I am available to provide further details on the plugin. In the meanwhile, I have made available an architecture documentation<https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.c…> that contains a primer on pytest and detailed explanation of the plugin. Perhaps the contents of this document is of interest to the pytest community more generally. Feel free to provide comments and share more widely. Again, very-well done for maintaining pytest. Best, Guilherme Zagatti ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. ______________________________________________________________________

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pytest-airflow plugin
by Guilherme Zagatti March 12, 2019

March 12, 2019

Dear Pytest Development Community, My name is Guilherme Zagatti. I am a developer at Flowminder, an award winning social-enterprise especializing in the use of Big Data for international development. We are big fans of pytest. We needed to integrate pytest with Airflow to develop data quality assurance tests before ingesting data to our databases. Therefore we created the pytest-airflow pluging. We just made it available to [pypi](https://pypi.org/project/pytest-airflow/) and [open sourced in Github](https://github.com/Flowminder/pytest-airflow). It would be great to receive feedback from the pytest community and your suggestions on how to best promote the plugin to other users. I am available to provide further details on the plugin. In the meanwhile, I have made available [an architecture documentation](https://github.com/Flowminder/pytest-airflow/blob/master/doc… that contains a primer on pytest and detailed explanation of the plugin. Perhaps the contents of this document is of interest to the pytest community more generally. Feel free to provide comments and share more widely. Again, very-well done for maintaining pytest. Best, Guilherme Zagatti

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