Дмитрий Крюков (Parallels): Мы привыкли к тому, что джанга это фулстек фреймворк, который диктует нам достаточно четкую проектную структуру, однако мы же всё же попробуем разрушить этот миф. Поиздеваемся над Django? Превратим его во бутылеподобный фреймворк (Flask, Bottle)? Даешь велосипеды!!!

1. Micro Django
or Lightweigth

2. Background

3. Django vs Flaskbottle
~14K
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★★
~13K
★★★★
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ORM poo !!!
Templates poo !!!
38 Mb (25 Mb contrib)
70K SLOC
1.4 + 1.8 + 1.8 Mb (7.5 orm)
6 + 9 + 10 K SLOC (+ 50 orm
request andapp context

4. Django Micro?

5. Structureless
manage.py
if __name__ == "__main__":
os.environ.setdefault( "DJANGO_SETTINGS_MODULE" , "settings")
from django.core.management import execute_from_command_line
execute_from_command_line(sys.argv)

6. Structureless
Загрузка setting(https://docs.djangoproject.com/en/1.8/topics/settings/#using-settings-without-setting-django-settings-module)
if not settings.configured:
settings.configure(
DEBUG=DEBUG,
SECRET_KEY =SECRET_KEY,
ROOT_URLCONF =__name__,
...
)

7. Structureless
urlconf
urlpatterns = (
url(r'^$', lambda r: JsonResponse({ 'App': 'Simple’})),
)

8. Simple app
import os
import sys
from django.conf import settings
...
if not settings.configured:
settings.configure(
ROOT_URLCONF =__name__,
...
)
urlpatterns = (url(r'^$', lambda r: JsonResponse({ 'A simple app must be' : 'simple'})),)
if __name__ == "__main__":
from django.core.management import execute_from_command_line
execute_from_command_line(sys.argv)

9. OMG ORM! Failed!
Traceback:..
...
django.core.exceptions.ImproperlyConfigured: Unable to detect the app label
for model "Task." Ensure that its module, "__main__", is located inside an
installed app.

10. OMG ORM! Failed!
INSTALLED_APPS =(
...
'__main__'
),
Traceback:..
...
django.core.exceptions.ImproperlyConfigured: Unable to detect the app label
for model "Task." Ensure that its module, "__main__", is located inside an
installed app.

11. OMG ORM! Failed!
execute_from_command_line -> django.setup()
if not settings.configured:
settings.configure(
...
)
from django.apps import apps
apps.populate(settings.INSTALLED_APPS)
class Model(models.Model):
...

12. OMG ORM! Successfully!
if not settings.configured:
settings.configure(
...
MIGRATION_MODULES ={'__main__': 'migrations'},
INSTALLED_APPS =(
...
'__main__'
),
)
...

13. Through AppConfig
class App(AppConfig):
label = APP_LABEL
app = App('name', sys.modules[__name__])
...
INSTALLED_APPS=(
app
),
...
class Task(models.Model):
class Meta:
app_label = APP_LABEL
...

14. Through sys.modules
PyCon 2015 David Beazley - Modules and Packages
from types import ModuleType
import django
class Settings(ModuleType):
DEBUG = False
...
sys.modules['settings'] = Settings
os.environ.setdefault( "DJANGO_SETTINGS_MODULE" , "settings")
django.setup()

15. Freedom (- Django ORM)
...
from sqlite3 import dbapi2 as sqlite3
def get_db():
rv = sqlite3.connect('tasks.db', check_same_thread=False)
rv.row_factory = sqlite3.Row
return rv
def view(request):
db = get_db()
cur = db.execute('SELECT * FROM task WHERE task.session_id=$1 order by id desc',
[request.session.session_key, ])
tasks = cur.fetchall()
return JsonResponse({task['id']: {'body': task['body'], 'title': task['title'], 'active':
task['is_active']} for task in tasks})

16. SQLAlchemy
from sqlalchemy import create_engine
...
engine = create_engine('sqlite:///tasks.db', convert_unicode=True)
db_session = scoped_session(sessionmaker(autocommit=False, autoflush=False,
bind=engine))
class Task(Base):
__tablename__ = 'task'
...
def view(request):
tasks = Task.query.filter(Task.session_id == request.session.session_key)
return JsonResponse({task.id: {'body': task.body, 'title': task.title, 'active':
task.is_active} for task in tasks})

17. Peewee
import peewee
db = peewee.SqliteDatabase('tasks.db')
class Task(peewee.Model):
...
def view(request):
tasks = Task.select().where(Task.session_id == request.session.session_key)
return JsonResponse({task.id: {'body': task.body, 'title': task.title, 'active':
task.is_active} for task in tasks})

18. Route decorator
@app.route(r'^tasks/$', methods=['GET'])
def _all(request):
...
@app.route(r'^tasks/$', methods=['POST'])
@app.route(r'^tasks/add/$', methods=['POST'])
def add(request):
...

19. Да
Нет

20. Ссылки
Вопросы???
Доклад Django Minus Django - http://www.youtube.com/watch?v=aFRH-oHcbn8
Мой репозиторий с примерами - https://goo.gl/6q6IRP
importd - https://goo.gl/SwzhLL
Доклад Егора Назаркина - Flask: Гордость и предубеждение - https://goo.gl/i3Hv5E
Обсуждение в блоге Ивана Сагалаева (маниакальный веблог) - http://goo.gl/Vh497y
settings.configure - https://goo.gl/WfyTSE
Benchmarks - http://goo.gl/pBpmmj, http://goo.gl/C8TFz5
PyCon 2015 David Beazley - Modules and Packages - http://www.youtube.com/watch?v=0oTh1CXRaQ0