pep8 is not enough

ealthy practices for happy and successful codebase

Misha Behersky KyivPy, September, 2016

Code style

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Same code

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Bearsharktopus

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pep8 is not enough

Grid, vertical, hanging indent, vertical hanging indent, hanging grid...

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isort

standard library modules

third-party modules

user-defined modules

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pycodestyle, pyflakes, pylint, pychecker, etc.

● No global found ● Passing the wrong number of parameters● Using format strings that don't match arguments● Using a variable before setting it● self is not the first parameter defined for a method● Unused function/method arguments (can ignore self)● No doc strings in modules, classes, functions● ...

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tick with strict rules

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Managing requirements

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pgrade fast

pypiup pip-tools

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Dependency hell

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Environments

● Develop in env that is as close as possible to production one

● Test in all possible envs that your app might run● Select your favourite IDE and use it)

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Testing

● Test what's likely to break● Test negative cases and edge cases● If writing tests is hard, that might be a bug● Aggressively make your test suite fast and reliable● Run it automatically

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Flaky???

● If it’s flaky it’s not a test*● Stop calling your build flaky*

*If I was in my office I would bite my tongue14

o not write tests

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rief is not better

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self-descriptive speaks for itself

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Overcommunicate

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Naming

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utomate routine

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Put your two cents in

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ail early

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ail early

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ail early

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Dream within a dream

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elete code as soon as you know you don't need it any more, no questions asked

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vulture

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Are you ready?

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ime is the only resource you truly need

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easure everything

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Wakatime

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cloc

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Toggl

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Other toolshttps://github.com/madisonmay/BlackWidow

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https://github.com/mschwager/cohesion

https://github.com/Yelp/undebt

ecap

● Play stupid● If you don’t try, you’ll never know● Save your energy for something better than

programming work● Consider and reason● …● ???● PROFIT!

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esources

https://github.com/timothycrosley/isort [6]

http://www.kennethreitz.org/essays/a-better-pip-workflow [10]

https://github.com/ekonstantinidis/pypiup [10]

http://semver.org [11]

https://tox.readthedocs.io/en/latest/ [12]

http://holger-peters.de/using-pyenv-and-tox.html [12]

https://eev.ee/blog/2016/08/22/testing-for-people-who-hate-testing [13]

https://github.com/box/flaky [14]

http://martinfowler.com/bliki/TwoHardThings.html [19]

https://github.com/myint/vulture [27]

http://bmwlog.pp.ua/post/105 [32]

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&

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e are hiring

datarobot.com/careers/38

hanks for your attention

bmwlog.pp.ua

bmwant@gmail.com

@bmwant

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