Flask web development, one drop at a time

HELLO.PY from ﬂask import Flask app = Flask(__name__) @app.route("/") def
hello(): return "hello world" if __name__ == "__main__": app.run()

BSD LICENSED

BUILT BY THE PROS Created by Armin Ronacher Pygments, Sphinx,
Jinja2, Werkzeug, Click

USED BY THE PROS Pinterest, Twilio, Linked-in, President Obama Campaign,
Reddit, Uber, etc.

DEAD SIMPLE hello word in 7 lines of code in
a single ﬁle

EASY TO UNDERSTAND just write your ordinary Python code no
pseudo-language to undestand

MANAGEABLE LEARNING CURVE learn as you go, don’t feel overwhelmed

NO IMPOSED STRUCTURE no need to understand things are the
wey they are: they aren’t

SMALL API 800 LOC, 1500 LOC Tests

WELL DOCUMENTED the equivalent of 200 A4 pages of excellent
documentation

FEATURES

WERKZEUG It's hard to ﬁnd anything that's simpler, more self-contained,
or purer-WSGI than Werkzeug — Alex Martelli

JINJA2 modern, fast, designer-friendly templating language inspired by Django templates
(!)

DEVELOPMENT SERVER app.run()

DEBUGGER app.run(debug=True)

UNIT TESTING ﬂask.app.test_client()

RESTFUL REQUEST DISPATCHING modern web applications have beautiful URLs

SIGNED SESSION COOKIES session allows you to securely store information
speciﬁc to a user from one request to the next

100% WSGI COMPLIANT

VERY STABLE (despite being in beta)

RICH ECOSYSTEM Flask-SQLAlchemy, Flask-Admin, Flask-Cache, Flask-Cors, Flask-Login, Flask-Mail, etc.

HELLO WORLD

HELLO.PY from ﬂask import Flask app = Flask(__name__) @app.route("/") def
hello(): return render_template('hello.html') if __name__ == "__main__": app.run()

HELLO.HTML {% extends 'layout.html' %} {% block title %}Greetings{% endblock
%} {% block body %} <h1>Hello {{ name }}!</h1> {% endblock

LAYOUT.HTML <!doctype html> <head> <title>{% block title %}{% endblock %}</title>
</head> <body> {% block body %}{% endblock %} </body>

INSTALL AND RUN $ pip install Flask $ python hello.py
* Running on http://localhost:5000/

EXTENSIONS RUNDOWN: FLASK-SQLALCHEMY from flask import Flask from flaskext.sqlalchemy import
SQLAlchemy app = Flask(__name__) db = SQLAlchemy(app) class User(db.Model): name = db.Column(db.String(40), primary_key=True) email = db.Column(db.String(100)) @app.route('/user/<name>') def show_user(name): user = User.query.filter_by(name=name).first_or_404() return render_template('user.html', user=user)

Flask web development, one drop at a time

Flask web development, one drop at a time

Nicola Iarocci

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Transcript

HELLO.PY from ﬂask import Flask app = Flask(name) @app.route("/") def

ABOUT

BSD LICENSED

BUILT BY THE PROS Created by Armin Ronacher Pygments, Sphinx,

USED BY THE PROS Pinterest, Twilio, Linked-in, President Obama Campaign,

DEAD SIMPLE hello word in 7 lines of code in

EASY TO UNDERSTAND just write your ordinary Python code no

MANAGEABLE LEARNING CURVE learn as you go, don’t feel overwhelmed

NO IMPOSED STRUCTURE no need to understand things are the

SMALL API 800 LOC, 1500 LOC Tests

WELL DOCUMENTED the equivalent of 200 A4 pages of excellent

FEATURES

WERKZEUG It's hard to ﬁnd anything that's simpler, more self-contained,

JINJA2 modern, fast, designer-friendly templating language inspired by Django templates

DEVELOPMENT SERVER app.run()

DEBUGGER app.run(debug=True)

UNIT TESTING ﬂask.app.test_client()

RESTFUL REQUEST DISPATCHING modern web applications have beautiful URLs

SIGNED SESSION COOKIES session allows you to securely store information

100% WSGI COMPLIANT

VERY STABLE (despite being in beta)

RICH ECOSYSTEM Flask-SQLAlchemy, Flask-Admin, Flask-Cache, Flask-Cors, Flask-Login, Flask-Mail, etc.

HELLO WORLD

HELLO.PY from ﬂask import Flask app = Flask(name) @app.route("/") def

HELLO.HTML {% extends 'layout.html' %} {% block title %}Greetings{% endblock

LAYOUT.HTML <!doctype html> <head> <title>{% block title %}{% endblock %}</title>

INSTALL AND RUN $ pip install Flask $ python hello.py

EXTENSIONS RUNDOWN: FLASK-SQLALCHEMY from ﬂask import Flask from ﬂaskext.sqlalchemy import