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DOING MORE WITH LESS Large Scale Apps with FLASK Friday, 2 March, 12

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Pocoo Friday, 2 March, 12

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Friday, 2 March, 12

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JINJA FLASK PYGMENTS WERKZEUGSPHINX ... Friday, 2 March, 12

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MICROFramework Friday, 2 March, 12

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MICRO Friday, 2 March, 12

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Database Abstraction Friday, 2 March, 12

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Database Abstraction Friday, 2 March, 12

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Form Validation Friday, 2 March, 12

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Form Validation Friday, 2 March, 12

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Django-ish Admin Friday, 2 March, 12

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Django-ish Admin Friday, 2 March, 12

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Jinja 2 Werkzeug & Friday, 2 March, 12

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Templating WSGI & Friday, 2 March, 12

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Tools Friday, 2 March, 12

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Friday, 2 March, 12

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gunicorn Friday, 2 March, 12

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gunicorn gevent Friday, 2 March, 12

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gunicorn gevent nginx Friday, 2 March, 12

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Friday, 2 March, 12

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unittest2/nose Friday, 2 March, 12

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unittest2/nose lettuce Friday, 2 March, 12

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Friday, 2 March, 12

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fabric Friday, 2 March, 12

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fabric virtualenv Friday, 2 March, 12

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fabric virtualenv jenkins Friday, 2 March, 12

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RESTful/ish APIs Friday, 2 March, 12

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Warning CODE BEYOND THIS POINT Friday, 2 March, 12

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Friday, 2 March, 12

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from flask import Flask Friday, 2 March, 12

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from flask import Flask app = Flask(__name__) Friday, 2 March, 12

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from flask import Flask app = Flask(__name__) @app.route("/") Friday, 2 March, 12

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from flask import Flask app = Flask(__name__) @app.route("/") def hello(): Friday, 2 March, 12

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from flask import Flask app = Flask(__name__) @app.route("/") def hello(): return "Hello World!" Friday, 2 March, 12

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from flask import Flask app = Flask(__name__) @app.route("/") def hello(): return "Hello World!" if __name__ == "__main__": Friday, 2 March, 12

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from flask import Flask app = Flask(__name__) @app.route("/") def hello(): return "Hello World!" if __name__ == "__main__": app.run() Friday, 2 March, 12

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$ pythonhello.py Friday, 2 March, 12

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Werkzeug Router Friday, 2 March, 12

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@app.route(‘/’) Friday, 2 March, 12

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@app.route(‘/dashboard’) @app.route(‘/’) Friday, 2 March, 12

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@app.route(‘/dashboard’) @app.route(‘/’) @app.route(‘/pages/’) Friday, 2 March, 12

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@app.route(‘/dashboard’) @app.route(‘/’) @app.route(‘/pages/’) @app.route(‘/user/’) Friday, 2 March, 12

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@app.route(‘/dashboard’) @app.route(‘/’) @app.route(‘/pages/’) @app.route(‘/user/’) @app.route(‘/posts//’) Friday, 2 March, 12

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@app.route(‘/dashboard’) @app.route(‘/’) @app.route(‘/pages/’) @app.route(‘/user/’) @app.route(‘/posts//’) @app.route(‘/’) Friday, 2 March, 12

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Custom Converters Friday, 2 March, 12

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from werkzeug.routing import BaseConverter class ListConverter(BaseConverter): def to_python(self, value): return value.split(',') def to_url(self, values): return ','.join(BaseConverter.to_url(value) for value in values) app = Flask(__name__) app.url_map.converters['list'] = ListConverter Friday, 2 March, 12

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Testing Friday, 2 March, 12

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UNITTEST FACTORY_BOY LETTUCE NOSEMOCK ... Friday, 2 March, 12

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Thread/Context Locals Friday, 2 March, 12

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with app.test_request_context('/posts?sort=asc&limit=10'): Friday, 2 March, 12

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with app.test_client() as client: result = client.get('/posts?sort=asc&limit=10') Friday, 2 March, 12

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Useful Extensions Friday, 2 March, 12

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Friday, 2 March, 12

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Flask-Login Friday, 2 March, 12

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Flask-Login Flask-Testing Friday, 2 March, 12

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Flask-Login Flask-Testing Flask-WTForms Friday, 2 March, 12

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Flask-Login Flask-Testing Flask-WTForms Flask-Bcrypt Friday, 2 March, 12

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Flask-Login Flask-Testing Flask-WTForms Flask-Bcrypt Flask-Assets Friday, 2 March, 12

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ORM Integration Friday, 2 March, 12

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Friday, 2 March, 12

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SQLAlchemy Friday, 2 March, 12

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SQLAlchemy MongoKit Friday, 2 March, 12

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SQLAlchemy MongoKit Pycassa Friday, 2 March, 12

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SQLAlchemy MongoKit Pycassa CouchDB Friday, 2 March, 12

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from flask import Flask from flaskext.sqlalchemy import SQLAlchemy app = Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////tmp/test.db' db = SQLAlchemy(app) class User(db.Model): id = db.Column(db.Integer, primary_key=True) username = db.Column(db.String(80), unique=True) email = db.Column(db.String(120), unique=True) def __init__(self, username, email): self.username = username self.email = email def __repr__(self): return '' % self.username Friday, 2 March, 12

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from flask import Flask from mongokit import Connection, Document # configuration MONGODB_HOST = 'localhost' MONGODB_PORT = 27017 # create the little application object app = Flask(__name__) app.config.from_object(__name__) # connect to the database connection = Connection(app.config['MONGODB_HOST'], app.config['MONGODB_PORT']) Friday, 2 March, 12

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class Post(Document): structure = { 'title':unicode, 'body':unicode, 'author':unicode, 'date_creation':datetime.datetime, 'rank':int, 'tags': [unicode], } required_fields = ['title','author', 'date_creation'] default_values = {'rank':0, 'date_creation': datetime.datetime.utcnow} Friday, 2 March, 12

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Callbacks/hooks Friday, 2 March, 12

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@app.before_request Friday, 2 March, 12

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@app.before_request @app.after_request Friday, 2 March, 12

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@app.before_request @app.after_request @app.before_first_request Friday, 2 March, 12

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@app.before_request @app.after_request @app.before_first_request @app.errorhandler Friday, 2 March, 12

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@app.before_request @app.after_request @app.before_first_request @app.errorhandler ... Friday, 2 March, 12

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Signals via Blinker Friday, 2 March, 12

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flask.template_rendered Friday, 2 March, 12

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flask.request_started flask.template_rendered Friday, 2 March, 12

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flask.request_started flask.request_finished flask.template_rendered Friday, 2 March, 12

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flask.request_started flask.request_finished flask.template_rendered flask.got_request_exception Friday, 2 March, 12

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flask.request_started flask.request_finished flask.template_rendered flask.got_request_exception flask.request_tearing_down Friday, 2 March, 12

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In-process event dispatching Friday, 2 March, 12

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Not the same as callbacks/hooks Friday, 2 March, 12

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API Design Friday, 2 March, 12

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Start thinking in terms of datastructures Friday, 2 March, 12

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And breaking up your application in to services Friday, 2 March, 12

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Instead of staying in the MVC Bubble. Friday, 2 March, 12

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Blueprints Friday, 2 March, 12

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from flask import Blueprint, render_template, abort from jinja2 import TemplateNotFound static_page = Blueprint('static_page', __name__, template_folder='templates') @static_page.route('/') def show(page): try: return render_template('pages/%s.html' % page) except TemplateNotFound: abort(404) Friday, 2 March, 12

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from flask import Flask from myapp.static_page import static_page app = Flask(__name__) app.register_blueprint(static_page, url_prefix= ‘/pages’) Friday, 2 March, 12

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Blueprints have their own templates, static files, and callbacks/hooks. Friday, 2 March, 12

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Pluggable Views Friday, 2 March, 12

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@app.route('/users/') def show_users(page): users = User.query.all() return render_template('users.html', users=users) Friday, 2 March, 12

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from flask.views import View class ShowUsers(View): def dispatch_request(self): users = User.query.all() return render_template('users.html', objects=users) app.add_url_rule('/users/', ShowUsers.as_view('show_users')) Friday, 2 March, 12

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from flask.views import View class ListView(View): def get_template_name(self): raise NotImplementedError() def render_template(self, context): return render_template(self.get_template_name(), **context) def dispatch_request(self): context = {'objects': self.get_objects()} return self.render_template(context) class UserView(ListView): def get_template_name(self): return 'users.html' def get_objects(self): return User.query.all() Friday, 2 March, 12

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Method-Based Dispatching Friday, 2 March, 12

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from flask.views import MethodView class User(MethodView): def get(self): users = User.query.all() ... def post(self): user = User.from_form_data(request.form) ... app.add_url_rule('/users/', view_func=User.as_view('users')) Friday, 2 March, 12

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QUESTIONS? Friday, 2 March, 12

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Fictive Kin Friday, 2 March, 12

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@jperras Joël Perras http://nerderati.com Friday, 2 March, 12