Python web frameworks

http://creativecommons.org/licenses/by-nc-sa/3.0/
Leganés, 11 y 12 de
febrero
José Manuel Ortega
Leganés, 11 y 12 de febrero
José Manuel Ortega
@jmortegac
Python para desarrolladores web

2 Python para desarrolladores web
https://speakerdeck.com/jmortega

 Stack,Django,Flask,Pyramid
 Requests
 Scraping(BeautifulSoap,Scrapy)
 Bokeh
 API Rest (Django-Rest-Framework)
 Twitter API
Agenda

Python Zen

Stack

Django

Django
7
 Most popular Python web framework
 Full stack web framework
 Django-ORM
 Template Engine
 HTTP Request/Response
 URL Routing Mechanism
 Testing
 Dev Server (WSGI)

Django
8
 Model TemplateView
 Model → modelo de datos (models.py)
 View →vistas de datos (views.py): qué datos se presentan
 Template → plantillas HTML:cómo se presentan los datos

Django
9
 django.contrib.auth Un sistema de autenticación
 django.contrib.contenttypes  Un framework para
tipos de contenidos
 django.contrib.sessions  Un framework para
manejar sesiones
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.sqlite3',
'NAME': 'mysite.db',
}
}

Django ORM

Django Templates
11
 Templates are composed by Blocks

Django example project

Django-oscar
14
http://oscarcommerce.com
https://github.com/django-oscar/django-oscar

Flask
15
 Microframework
 Built in development server and debugger
 Oriented to small applications with simpler
requirements.

Flask example

Flask

Flask
http://httpbin.org

Pyramid
19
 Python3 compatible
 Templates with Chamaleon
 Like django has his own bootstraping
toolpcreate

Pyramid
20
pcreate -s starter hello_pyramid
├── CHANGES.txt
├── development.ini
├── MANIFEST.in
├── production.ini
├── hello_pyramid
│ ├── __init__.py
│ ├── static
│ │ ├── pyramid-16x16.png
│ │ ├── pyramid.png
│ │ ├── theme.css
│ │ └── theme.min.css
│ ├── templates
│ │ └── mytemplate.pt
│ ├── tests.py
│ └── views.py
├── README.txt
└── setup.py

Pyramid
Learn REST API with Python in 90 minutes21

Pyramid
Pserve development.ini

Pyramid
23
https://badges.fedoraproject.org
https://github.com/fedora-infra/tahrir

Comparing web frameworks
24
Django Pyramid Flask
ORM Django-
ORM
Bootstrapping django-
admin
pcreate
Templates Chameleon
Migrations
Admin
interface
Visual debug

Requests Module
 Python’s standard urllib2,httplib module provides most
of the HTTP capabilities you need, but the API is
thoroughly broken.
 Python HTTP: Requests. Beautiful, simple, Pythonic.
25
http://www.python-requests.org

Use requests module
 Install requests module (pip install requests)
http://docs.python-requests.org/en/latest/user/install/#install
 Use it interactive mode
$ python
>>> import requests
>>> r = requests.get("http://httpbin.org/get")

Use requests module

Beautiful Soup
29
 Librería que permite el parseo de páginas web
 Soporta parsers como lxml,html5lib
 Instalación
 pip install lxml
 pip instlal html5lib
 pip install beautifulsoup4

Obtain links with bs4

Extract images with lxml
32
import requests
from lxml import html

Extract program

JSON in python
34
 import json
 json_dumps(data, sort_keys=True)
 Maybe allow human readable output
 json_dumps(data, sort_keys=True, indent=4)

Scrapy

Scrapy / pip install scrapy

Scrapy shell
37
scrapy shell <url>
from scrapy. import Selector
hxs = Selector(response)
Info = hxs.select(‘//div[@class=“slot-inner”]’)

Scrapy shell

Scrapy spiders

Scrapy spiders
40
$ scrapy crawl <spider_name>
$ scrapy crawl <spider_name> -o items.json -t json
$ scrapy crawl <spider_name> -o items.csv -t csv
$ scrapy crawl <spider_name> -o items.xml -t xml

Twisted
41
 Event-driven networking engine
 Procesar eventos de forma asíncrona
 https://twistedmatrix.com

Bokeh
42
 Interactive, browser-based visualization for big
data, driven from Python
 http://bokeh.pydata.org
 Rich interactivity over large datasets
 HTML5 Canvas
 Integration with Google Maps
 http://bokeh.pydata.org/en/latest/docs/gallery.html

Bokeh

Bokeh Google maps

Javascript code generation

Bokeh charts

API Rest in Python
48
 Django Rest Framework (DRF)
pip install djangorestframework

Django Rest Framework
49
Serializers &Views
class PostSerializer(serializers.HyperlinkedModelSerializer):
class Meta:
model = Post
fields = ('author', 'title', 'text', 'created_date','published_date')
class PostViewSet(viewsets.ModelViewSet):
queryset = Post.objects.all()
serializer_class = PostSerializer
from rest_framework import routers, serializers, viewsets

50
Urls

Twitter API
52
 https://apps.twitter.com
 Oauth2
 Consumer API (API KEY)
 Consumer Secret (API Secret)
 Access Token
 Access Token Secret

Twitter API
53
 Python-twitter
 https://github.com/bear/python-twitter
 Tweepy
 https://github.com/tweepy/tweepy

Tweepy
54
import tweepy
from tweepy import OAuthHandler
consumer_key = 'YOUR-CONSUMER-KEY'
consumer_secret = 'YOUR-CONSUMER-SECRET'
access_token = 'YOUR-ACCESS-TOKEN'
access_secret = 'YOUR-ACCESS-SECRET'
auth = OAuthHandler(consumer_key, consumer_secret)
auth.set_access_token(access_token, access_secret)
 api = tweepy.API(auth)

Tweepy
 Timeline
 Tweet list
 Trending topic
for status in tweepy.Cursor(api.home_timeline).items(10):
print(status.text)
for tweet in tweepy.Cursor(api.user_timeline).items():
process_or_store(tweet._json)
def getTrends():
trends = api.trends_place(1)[0]['trends']
return trends

Python-twitter
56
import twitter
apiTwitter = twitter.Api(consumer_key="xxx", consumer_secret="xxx",
access_token_key="xxx", access_token_secret="xxx")
query = apiTwitter.GetSearch("#T3chFest2016“,count=50)
for result in query:
tweet = {}
tweet['text'] = result.text.encode('utf-8')
tweet['date'] = result.created_at.encode('utf-8')
tweet['favorite_count'] = result.favorite_count
tweet['lang'] = result.lang.encode('utf-8')
tweet['retweet_count'] = result.retweet_count
tweet['account'] = result.user.screen_name.encode('utf-8')
twitter_results.append(tweet)

Python-twitter

Python-twitter
58
outfile = open('twitter.json','wb')
for twitter_result in twitter_results:
line = json.dumps(twitter_result) + "n"
outfile.write(line)

Python in the cloud

Git
 https://github.com/jmortega/t3chfest_python_examples

References
 Django project: http://www.djangoproject.com
 Flask: http://flask.pocoo.org
 Pyramid: http://www.pylonsproject.org
 Requests python module: http://www.python-requests.org
 BeautifulSoup: http://www.crummy.com/software/BeautifulSoup
 Bokeh:http://bokeh.pydata.org
 Django Rest:http://www.django-rest-framework.org
 https://www.pythonanywhere.com

Thank you!
José Manuel Ortega <@jmortegac>

Python web frameworks

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