Web backends development
using Python
Ayun Park

Ayun Park
iamparkayun@gmail.com / http://parkayun.kr / https://github.com/Parkayun
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add2paper
http://www.add2paper.com / http://www.additpay.com
Korea No.1 Mobile media for college students.
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122 universities

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based on django
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used flask
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used tornado
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tried aiohttp
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django, flask, tornado
and aiohttp
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django
Most popular Python web framework
Full stack web framework
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Most popular
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Full stack
web framework
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= has almost everything
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Full stack
ORM
Template Engine
Tests
And more...
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ORM
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ORM
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ORM
>>> Foo.objects.filter(bar__contains=’1’)
SELECT "world_foo"."id", "world_foo"."bar",
"world_foo"."created_at", "world_foo"."modified_at"
FROM "world_foo" WHERE "world_foo"."bar" LIKE
‘%1%’ ESCAPE '' LIMIT 21
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ORM
MySQL
PostgreSQL
Oracle
MSSQL (unofficial)
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template engine
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template engine
a lot of useful builtin tags
intcomma
autoescape
linebreaks
also can make custom tags
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tests
based on unittest
TestCase
TransactionTestCase
LiveServerTestCase
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And more...
django admin
useful middlewares
session management
protection against csrf attack
migration
And more... in djangoproject.com
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= django has super
productivity
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In my case
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I use django when need
web pages(html).
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django was born for
web sites.
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flask
Very popluar Python web framework in developers
Microframework
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Very popular
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Werkzeug
jinja2
useful extensions
Microframework
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Werkzeug
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= WSGI Utility Library
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= HTTP Server using
Python (PEP333)
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= URL Route and
Response
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jinja2
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= template engine
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similar with django’s
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Microframework
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= has almost nothing
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= has free
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= useful extensions
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SQLAlchemy (Flask-SQLAlchemy)
ORM
Alembic (Flask-Alembic)
Migration
Flask-Login
session management
useful extensions
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In my case
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I use flask in
anytime.
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flask is
a microframework.
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tornado
Web framework
Asynchronous network library
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Web framework
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similar with flask
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= has template engine
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also, similar with
django’s
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but, It hasn’t
enough bulitin tags.
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Asynchronous
network library
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= tornado’s key feature
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After, Python2
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has asyncio
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= has async features
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But, tornado has that
since Python2.
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= has good performance
since Python2
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= can code socket
and more
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= even as a container
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In my case
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I use tornado when
build websocket
and use nosql.
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Async is tornado’s
key feature.
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Not use async
with rdbms.
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or as a wsgi container
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aiohttp
HTTP Client / Server for asyncio
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HTTP Server
for asyncio.
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= HTTP Server
for Python3.
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= like a werkzeug
in flask.
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= URL Route and
Response
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In my case
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I use aiohttp when
build websocket
or try experiment.
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There are some
async rdbms driver
for Python3.
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I just started
web framework
based on aiohttp.
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In github
Parkayun/astrid
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In Real World
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Yes, Python is slow.
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check transaction.
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check file io.
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‘’.join((‘a’, ‘b’)) > ‘a’ + ‘b’
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use Cache
(redis, memcached)
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uWSGI > gunicorn
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use gevent
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use PyPy
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normal stack
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django / flask
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uWSGI / gunicron
nginx / apache
MySQL / PostgreSQL / Oracle / MSSQL
Cache
(redis / memcached / rabbitmq)
reverse proxy

Thanks a lot!