Jython: Python para la plataforma Java (JRSL 09)

Python para la Plataforma Java Leo Soto M. Jornadas Regionales del Software Libre 2009

Avisos Comerciales...

Python para la plataforma Java

¿Plataforma Java sin Java?

http://www.ﬂickr.com/photos/lab2112/457187539/

Plataforma Java con Java y Python, Ruby, Scala, Groovy...

¿Por qué Python?

“Python is an experiment in how much freedom programmers need...”

“...Too much freedom and nobody can read another's code; too little and expressiveness is endangered” - Guido van Rossum, 1996

Python Dinámico, ﬂexible, extremadamente legible

Jython Dinámico, ﬂexible, extremadamente legible En una plataforma ubicua, sólida

http://www.ﬂickr.com/photos/mushon/282287572/

Jython!

Jython, 12 años después http://www.ﬂickr.com/photos/digital-noise/3650559857/

Full compatibilidad con CPython

web2py etree nose setuptools virtualenv

¿Pero qué puedo hacer con Jython hoy?

Demo con Swing

De Java a Jython

final JFrame frame = new JFrame("HelloSwing"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(300,300);

frame = JFrame("HelloSwing") frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) frame.setSize(300,300)

frame = JFrame("HelloSwing", defaultCloseOperation=JFrame.EXIT_ON_CLOSE, size=(300, 300))

Container content = frame.getContentPane(); content.setLayout(new FlowLayout());

content = frame.contentPane content.setLayout(new FlowLayout());

content = frame.contentPane content.layout = FlowLayout()

JButton botonSaludar = new JButton("Saludar"); JButton botonDespedir = new JButton("Despedirse"); botonSaludar.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { JOptionPane.showMessageDialog(frame, "Hola!"); } }); botonDespedir.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { JOptionPane.showMessageDialog(frame, "Chao!"); frame.dispose(); } }); content.add(botonSaludar); content.add(botonDespedir);

def saludar(event): JOptionPane.showMessageDialog(frame, "Hola!") def despedir(event): JOptionPane.showMessageDialog(frame, "Chao!") frame.dispose() content.add(JButton("Saludar", actionPerformed=saludar)) content.add(JButton("Despedirse", actionPerformed=despedir))

Otra demo con Swing (Si es que tenemos acceso a internet)

Créditos: Frank Wierzbicki

Demo con Django

Y sólo por diversión...

### View #!/usr/bin/env python from django import http """ from django.template import Template, Context WSW - the World's Shittiest Wiki. """ def wsw(request, title): import re title = urllib.unquote_plus(title) if title else "Home" import urllib p, created = Page.objects.get_or_create(title=title) from django.conf import settings form = PageForm(instance=p) if request.method == "POST": ### Config form = PageForm(request.POST, instance=p) settings.configure( form.save() DEBUG = True, return http.HttpResponseRedirect(request.get_full_path()) DATABASE_ENGINE = "doj.backends.zxjdbc.postgresql", else: DATABASE_NAME = "wsw", form = PageForm(instance=p) DATABASE_USER = "wsw", t = Template("""<h1>{{ p.title }}</h1><ul>{% for p in DATABASE_PASSWORD = "wsw", allpages %}<li><a href="{{ p }}">{{ p }}</a></li>{% endfor %} ROOT_URLCONF = __name__) </ul><form action="{{ request.get_full_path }}" method="POST"> <p>{{ form.content }}</p><input type="submit"></form>""") ### Model wikiwords = re.findall( from django.db import models '[A-Z][a-z]+[A-Z][a-z]+(?:[A-Z][a-z]+)*', p.content) allpages = [ class Page(models.Model): page.title for page in Page.objects.order_by('title')] title = models.CharField(max_length=300, allpages.extend( primary_key=True) word for word in wikiwords if word not in allpages) content = models.TextField() return http.HttpResponse(t.render(Context(locals()))) class Meta: ### Main app_label = "wsw" if __name__ == '__main__': from django.core import management ### URLs from django.db import connection from django.conf.urls.defaults import * from django.core.management.color import no_style cursor = connection.cursor() urlpatterns = patterns(__name__, ('(.*)', 'wsw')) statements, _ = connection.creation.sql_create_model( Page, no_style()) ### Form try: from django.forms import ModelForm for sql in statements: cursor.execute(sql) class PageForm(ModelForm): connection.connection.commit() class Meta: except: model = Page pass fields = ['content'] management.call_command('runserver')

Créditos: Jacob Kaplan-Moss

Testing http://www.ﬂickr.com/photos/emotionaltoothpaste/26034597/

DocTests

def factorial(n): It must also not be ridiculously large: """Return the factorial of n, an >>> factorial(1e100) exact integer >= 0. Traceback (most recent call last): ... If the result is small enough to OverflowError: n too large fit in an int, return an int. """ Else return a long. import math >>> [factorial(n) if not n >= 0: ... for n in range(6)] raise ValueError("n must be >= 0") [1, 1, 2, 6, 24, 120] if math.floor(n) != n: >>> [factorial(long(n)) raise ValueError( ... for n in range(6)] "n must be exact integer") [1, 1, 2, 6, 24, 120] if n+1 == n: # catch a value like 1e300 >>> factorial(30) raise OverflowError("n too large") 265252859812191058636308480000000L result = 1 >>> factorial(30L) factor = 2 265252859812191058636308480000000L while factor <= n: >>> factorial(-1) result *= factor Traceback (most recent call last): factor += 1 ... return result ValueError: n must be >= 0 Factorials of floats are OK, but the float must be an exact integer: >>> factorial(30.1) Traceback (most recent call last): ... ValueError: n must be exact integer >>> factorial(30.0) 265252859812191058636308480000000L

Demo de (ab)uso de DocTest

¿Por cierto, quien más usa Jython?

EADS http://www.ﬂickr.com/photos/nguyendai/694158734/

Lockheed Martin http://www.ﬂickr.com/photos/rcsj/2504022678/

¿Y dónde puedo aprender más?

jythonbook.com

¿Preguntas? Contacto: @leosoto http://blog.leosoto.com

¡Gracias! Contacto: @leosoto http://blog.leosoto.com

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Jython: Python para la plataforma Java (JRSL 09)

by Leonardo Soto on Oct 12, 2009

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