Sippy Cup: A beginner's guide to Flask

A talk I gave to my fellow hackNY fellows.

Transcript

1. sippy cup @stevenleeg a beginner’s guide to flask
2. what is flask?
4. hello world from flask import Flask app = Flask(__name__) @app.route("/") def index(): return "Hello world" if __name__ == "__main__": app.run()
6. it makes sense
7. templates
8. @app.route("/") def index(): name = request.args.get("name", None) friends = ["steve", "hankcy", "rochacko"] return render_template("index.html", name = name, friends = friends ) templates
9. {% if name %} Hey there! Your name is {{name}}. {% endif %} <h1>Friends</h1> <ul> {% for friend in friends %} <li>{{friend|capitalize}}</li> {% endfor %} </ul> templates
12. extensions
17. from testapp import app from flask.ext.sqlalchemy import SQLAlchemy db = SQLAlchemy(app) class Person(db.Model): id = db.Column(db.Integer, primary_key = True) name = db.Column(db.String) age = db.Column(db.Integer) def __init__(self, name, age): self.name = name self.age = age
18. me = Person("Steve", 18) me.age += 1 bot = Person("Hankcy", 0) db.session.add(me) db.session.add(bot) db.session.commit()
19. >>> bot = Person.query.filter_by(name="Hankcy").first() <User u"Hankcy">
20. >>> people = Person.query.all() [<Person u"Steve">, <Person u"Hankcy">]
21. hankcy.age += 1 db.session.add(hankcy) db.session.commit()
22. db.session.delete(hankcy) db.session.commit()
24. beyond hello world
25. bigger codebases python packages virtualenv
26. deployment
27. deployment +
28. deployment +
29. deployment +
30. Just play with it
31. have fun! @stevenleeg