INTRODUCTION TO DEVELOP DJANGO PLUGIN PYCON JP 2016

@GIGINET

SELF INTRODUCTION ▸ Mobile / Rails Engineer @ Cookpad ▸ Hobby Python Programmer ▸ I’m not a professional

SELF INTRODUCTION ▸ Mobile / Rails Engineer @ Cookpad ▸ Hobby Python Programmer ▸ I’m not a professional

giginet/django-debug-toolbar-vcs-info

giginet/django-slack-invitation

giginet/django-generic-tagging

lambdalisue/django-permission

from django.db import models from django.contrib.auth.models import User class Article(models.Model): title = models.CharField('title', max_length=120) body = models.TextField('body') author = models.ForeignKey(User) collaborators = models.ManyToManyField(User) # apply AuthorPermissionLogic and CollaboratorsPermissionLogic from permission import add_permission_logic from permission.logics import AuthorPermissionLogic from permission.logics import CollaboratorsPermissionLogic add_permission_logic(Article, AuthorPermissionLogic()) add_permission_logic(Article, CollaboratorsPermissionLogic( field_name='collaborators', any_permission=False, change_permission=True, delete_permission=False, ))

lambdalisue/django-inspectional- registration

rosarior/awesome-django

GOAL GOAL ▸ Learn how to develop Python library ▸ especially Django plugin ▸ Develop more useful plugins ▸ Easy to use ▸ Easy to maintain

INTRODUCTION

TEXT WHAT'S DJANGO ▸ Web Application Framework in Python

Django 1.7 2014/9/2 Django 1.8 2015/4/1 Django 1.9 2015/12/1 Django 1.10 2016/8/1 Django 1.11 2017/4

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Django 1.7 2.7, 3.2, 3.3, 3.4 Django 1.8 2.7, 3.2, 3.3, 3.4, 3.5 Django 1.9 2.7, 3.4, 3.5 Django 1.10 2.7, 3.4, 3.5 Django 1.11 2.7, 3.4, 3.5

TEXT LANGUAGE ▸ Unfortunately, many Django applications still run on Python 2.x ▸ ☠Write in Python 2, use 2to3 ▸ ✨Write in Python 3 with compatibility with 2

HOW TO DEVELOP PLUGIN

WORKFLOW WORKFLOW 1. Implement 2. Write test 3. Setup test environment 4. Consider compatibility 5. Release

FILE HIERARCHY

FILE HIERARCHY Implementation

FILE HIERARCHY Testing

FILE HIERARCHY Documentation

FILE HIERARCHY Deploy

your_plugin __init__.py models.py, views.py, templates, etc… tests __init__.py test_foobar.py ….

FILE HIERARCHY Implementation

your_plugin __init__.py models.py, views.py, templates, etc… tests __init__.py test_foobar.py ….

HOW TO RETAIN COMPATIBILITY ▸ Use back-porting libraries ▸ __future__ ▸ cf. enum34, mock, pathlib, etc… ▸ http://python-future.org/ standard_library_imports.html

HOW TO RETAIN COMPATIBILITY ▸ six ▸ Utilities collection to compatible with 2 and 3 ▸ https://pythonhosted.org/six/

HOW TO RETAIN COMPATIBILITY from six import python_2_unicode_compatible @python_2_unicode_compatible class Cat(object): name = 'Tama' def __str__(self): return self

try: # Python 3 from urllib.parse import urljoin except ImportError: # Python 2 from urlparse import urljoin compat.py

TESTING

WHY TESTING ▸ Easy to check behavior ▸ Easy to maintain ▸ Follow dependencies(major version up of Django) ▸ Encourage contribution

FILE HIERARCHY Testing

import os import sys import django from django.conf import settings from django.test.utils import get_runner if __name__ == "__main__": os.environ['DJANGO_SETTINGS_MODULE'] = 'tests.settings' django.setup() TestRunner = get_runner(settings) test_runner = TestRunner() failures = test_runner.run_tests([“your_plugin”]) sys.exit(bool(failures)) https://docs.djangoproject.com/en/1.10/topics/testing/advanced/ runtests.py

INSTALLED_APPS = [ 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'your_plugin', ] tests/settings.py

if django.VERSION >= (1, 10): TEMPLATES = [ { 'BACKEND': 'django.template.backends.django.DjangoTemplates', 'DIRS': [], 'OPTIONS': { 'loaders': [ 'django.template.loaders.filesystem.Loader', 'django.template.loaders.app_directories.Loader', ], 'debug': DEBUG, }, } ] else: TEMPLATE_DEBUG = DEBUG TEMPLATE_DIRS = ( ) TEMPLATE_LOADERS = ( 'django.template.loaders.filesystem.Loader', 'django.template.loaders.app_directories.Loader', # 'django.template.loaders.eggs.Loader', )

from django.test import TestCase class CalculatorTestCase(TestCase): def test_add(self): self.assertEqual(1 + 1, 2) your_plugin/tests/test_calculator.py

$ python runtests.py Creating test database for alias 'default'... . --------------------------------------------------- ------------------- Ran 1 test in 0.001s OK Destroying test database for alias 'default'...

https://tox.readthedocs.io/en/latest/ 442742 442742 tox

[tox] envlist = py33-django{17,18}, {py27,py34}-django{17,18,19,110} py35-django{18,19,110} [testenv] basepython = py27: python2.7 py33: python3.3 py34: python3.4 py35: python3.5 deps= django17: django>=1.7,<1.8 django18: django>=1.8,<1.9 django19: django>=1.9,<1.10 django110: django>=1.10,<1.11 tox.ini

$ tox py33-django17: commands succeeded py33-django18: commands succeeded py27-django17: commands succeeded py27-django18: commands succeeded py27-django19: commands succeeded py27-django110: commands succeeded py34-django17: commands succeeded py34-django18: commands succeeded py34-django19: commands succeeded py34-django110: commands succeeded py35-django18: commands succeeded py35-django19: commands succeeded py35-django110: commands succeeded congratulations :)

$ tox -e py35-django110

USE DJANGO TESTING UTILITIES ▸ There are useful testing utilities in Django ▸ django.test.utils ▸ https://docs.djangoproject.com/en/1.10/_modules/ django/test/utils/

from django.test import TestCase, override_settings from django.conf import settings class APIClientTest(TestCase): @override_settings(API_TOKEN='token') def test_override_settings(self): self.assetEqual(settings['API_TOKEN'], 'token')

import time from django.test.utils import freeze_time def test_freeze_time(self): frozen_time = time.time() with freeze_time(frozen_time): self.assertEqual(time.time(), frozen_time)

from unittest import TestCase from .compat import Mock, patch class UserClientTest(TestCase): def test_request(self): response = Mock() response.json.side_effect = lambda: {'name': 'giginet'} response.status_code = 200 client = APIClient() with patch('requests.get', return_value=response) as get: user = client.users(name='giginet') get.assert_called_with('https://example.com/api/users', params={'name': 'giginet'})

try: from unittest.mock import patch, Mock except ImportError: from mock import patch, Mock

from django.db import models class TestArticle(models.Model): title = models.CharField('Title', max_length=255) class Meta: app_label = 'your_plugin' your_plugin/tests/models.py

INSTALLED_APPS = [ 'django.contrib.admin', 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.messages', 'django.contrib.staticfiles', 'your_plugin', 'your_plugin.tests' ] tests/settings.py

class UserFactory(factory.Factory): class Meta: model = models.User first_name = 'John' last_name = 'Doe' email = factory.Sequence(lambda n: 'person{0}@example.com'.format(n)) >>> UserFactory().email 'person0@example.com' >>> UserFactory().email 'person1@example.com' FactoryBoy/factory_boy

CONTINUOUS INTEGRATION

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sudo: false language: python python: - 2.7 - 3.3 - 3.4 - 3.5 install: - pip install tox tox-travis - pip install coverage coveralls script: - tox after_success: - coverage report - coveralls .travis.yml

ryanhiebert/tox-travis

sudo: false language: python python: - 2.7 - 3.3 - 3.4 - 3.5 install: - pip install tox tox-travis - pip install coverage coveralls script: - tox after_success: - coverage report - coveralls .travis.yml

coveralls.io

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sudo: false language: python python: - 2.7 - 3.3 - 3.4 - 3.5 install: - pip install tox tox-travis - pip install coverage coveralls script: - tox after_success: - coverage report - coveralls .travis.yml

USEFUL TOOLS ▸ requires.io ▸ scrutinizer ▸ landscape.io

requires.io

scrutinizer

landscape.io

DOCUMENTATION

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https://docs.readthedocs.io/en/latest/getting_started.html $ pip install sphinx sphinx- autobuild $ mkdir docs $ cd docs $ sphinx-quickstart $ make html

https://pythonhosted.org/an_example_pypi_project/sphinx.html def public_fn_with_sphinxy_docstring(name, state=None): """This function does something. :param name: The name to use. :type name: str. :param state: Current state to be in. :type state: bool. :returns: int -- the return code. :raises: AttributeError, KeyError """ return 0

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https://pythonhosted.org/an_example_pypi_project/sphinx.html def public_fn_with_googley_docstring(name, state=None): """This function does something. Args: name (str): The name to use. Kwargs: state (bool): Current state to be in. Returns: int. The return code:: 0 -- Success! 1 -- No good. 2 -- Try again. Raises: AttributeError, KeyError A really great idea. A way you might use me is >>> print public_fn_with_googley_docstring(name='foo', state=None)

readthedocs

DEPLOY

TEXT ▸ MANIFEST.in ▸ LICENSE.rst ▸ README.rst ▸ setup.py

include README.rst include LICENSE.rst include requirements.txt include requirements-test.txt MANIFEST.IN

README.rst

shields.io

from setuptools import setup, find_packages setup( name=NAME, version=VERSION, description='A Django Debug Toolbar panel to show VCS info', long_description=read('README.rst'), classifiers=[ 'Development Status :: 5 - Production/Stable', 'Environment :: Web Environment', 'Framework :: Django', 'Intended Audience :: Developers', 'License :: OSI Approved :: MIT License', 'Programming Language :: Python', 'Programming Language :: Python :: 2', 'Programming Language :: Python :: 2.7', 'Programming Language :: Python :: 3', 'Programming Language :: Python :: 3.3', 'Programming Language :: Python :: 3.4', 'Programming Language :: Python :: 3.5', 'Topic :: Internet :: WWW/HTTP', 'Topic :: Software Development :: Libraries', 'Topic :: Software Development :: Libraries :: Application Frameworks', 'Topic :: Software Development :: Libraries :: Python Modules', ], keywords='django django-debug-toolbar git vcs info revision hash panel', author='giginet', author_email='giginet.net@gmail.com', url='https://github.com/giginet/%s' % NAME, download_url='https://github.com/giginet/%s/tarball/master' % NAME, license='MIT', packages=find_packages(), include_package_data=True, package_data={ '': ['README.rst', 'requirements.txt', 'requirements-test.txt'], }, zip_safe=True, install_requires=readlist('requirements.txt'), test_suite='runtests.run_tests', tests_require=readlist('requirements-test.txt'), )

$ python setup.py register $ python setup.py sdist upload

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CONCLUSION ▸ How to develop Django plugin ▸ Workflow ▸ Testing ▸ Testing is IMPORTANT ▸ Documentation ▸ Deploying

ANY QUESTIONS?