PyCon HK 2015

1. Web backends development
using Python
Ayun Park

2. Ayun Park
iamparkayun@gmail.com / http://parkayun.kr / https://github.com/Parkayun
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3. add2paper
http://www.add2paper.com / http://www.additpay.com
Korea No.1 Mobile media for college students.
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4. 4

5. 5
122 universities

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7. 7

8. based on django
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9. used flask
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10. used tornado
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11. tried aiohttp
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12. django, flask, tornado
and aiohttp
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13. django
Most popular Python web framework
Full stack web framework
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14. Most popular
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15. Full stack
web framework
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16. = has almost everything
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17. Full stack
ORM
Template Engine
Tests
And more...
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18. ORM
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19. ORM
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20. 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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21. ORM
MySQL
PostgreSQL
Oracle
MSSQL (unofficial)
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22. template engine
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23. template engine
a lot of useful builtin tags
intcomma
autoescape
linebreaks
also can make custom tags
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24. tests
based on unittest
TestCase
TransactionTestCase
LiveServerTestCase
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25. And more...
django admin
useful middlewares
session management
protection against csrf attack
migration
And more... in djangoproject.com
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26. = django has super
productivity
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27. In my case
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28. I use django when need
web pages(html).
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29. django was born for
web sites.
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30. flask
Very popluar Python web framework in developers
Microframework
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31. Very popular
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32. Werkzeug
jinja2
useful extensions
Microframework
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33. Werkzeug
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34. = WSGI Utility Library
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35. = HTTP Server using
Python (PEP333)
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36. = URL Route and
Response
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37. jinja2
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38. = template engine
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39. similar with django’s
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40. Microframework
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41. = has almost nothing
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42. = has free
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43. = useful extensions
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44. SQLAlchemy (Flask-SQLAlchemy)
ORM
Alembic (Flask-Alembic)
Migration
Flask-Login
session management
useful extensions
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45. In my case
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46. I use flask in
anytime.
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47. flask is
a microframework.
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48. tornado
Web framework
Asynchronous network library
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49. Web framework
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50. similar with flask
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51. = has template engine
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52. also, similar with
django’s
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53. but, It hasn’t
enough bulitin tags.
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54. Asynchronous
network library
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55. = tornado’s key feature
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56. After, Python2
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57. has asyncio
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58. = has async features
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59. But, tornado has that
since Python2.
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60. = has good performance
since Python2
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61. = can code socket
and more
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62. = even as a container
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63. In my case
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64. I use tornado when
build websocket
and use nosql.
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65. Async is tornado’s
key feature.
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66. Not use async
with rdbms.
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67. or as a wsgi container
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68. aiohttp
HTTP Client / Server for asyncio
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69. HTTP Server
for asyncio.
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70. = HTTP Server
for Python3.
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71. = like a werkzeug
in flask.
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72. = URL Route and
Response
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73. In my case
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74. I use aiohttp when
build websocket
or try experiment.
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75. There are some
async rdbms driver
for Python3.
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76. I just started
web framework
based on aiohttp.
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77. In github
Parkayun/astrid
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78. In Real World
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79. Yes, Python is slow.
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80. check transaction.
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81. check file io.
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82. ‘’.join((‘a’, ‘b’)) > ‘a’ + ‘b’
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83. use Cache
(redis, memcached)
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84. uWSGI > gunicorn
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85. use gevent
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86. use PyPy
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87. normal stack
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88. django / flask
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uWSGI / gunicron
nginx / apache
MySQL / PostgreSQL / Oracle / MSSQL
Cache
(redis / memcached / rabbitmq)
reverse proxy

89. Thanks a lot!