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Jython: Python para la plataforma Java (JRSL 09)

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Jython: Python para la plataforma Java (JRSL 09)

  1. 1. Python para la Plataforma Java Leo Soto M. Jornadas Regionales del Software Libre 2009
  2. 2. Avisos Comerciales...
  3. 3. Python para la plataforma Java
  4. 4. ¿Plataforma Java sin Java?
  5. 5. http://www.flickr.com/photos/lab2112/457187539/
  6. 6. Plataforma Java con Java y Python, Ruby, Scala, Groovy...
  7. 7. ¿Por qué Python?
  8. 8. “Python is an experiment in how much freedom programmers need...”
  9. 9. “...Too much freedom and nobody can read another's code; too little and expressiveness is endangered” - Guido van Rossum, 1996
  10. 10. Python Dinámico, flexible, extremadamente legible
  11. 11. Jython Dinámico, flexible, extremadamente legible En una plataforma ubicua, sólida
  12. 12. http://www.flickr.com/photos/mushon/282287572/
  13. 13. 1997
  14. 14. Jython!
  15. 15. Jython, 12 años después http://www.flickr.com/photos/digital-noise/3650559857/
  16. 16. 2.5.1
  17. 17. Full compatibilidad con CPython
  18. 18. web2py etree nose setuptools virtualenv
  19. 19. OK
  20. 20. ¿Pero qué puedo hacer con Jython hoy?
  21. 21. GUIs
  22. 22. Demo con Swing
  23. 23. De Java a Jython
  24. 24. final JFrame frame = new JFrame("HelloSwing"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(300,300);
  25. 25. frame = JFrame("HelloSwing") frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) frame.setSize(300,300)
  26. 26. frame = JFrame("HelloSwing", defaultCloseOperation=JFrame.EXIT_ON_CLOSE, size=(300, 300))
  27. 27. Container content = frame.getContentPane(); content.setLayout(new FlowLayout());
  28. 28. content = frame.contentPane content.setLayout(new FlowLayout());
  29. 29. content = frame.contentPane content.layout = FlowLayout()
  30. 30. 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);
  31. 31. 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))
  32. 32. Otra demo con Swing (Si es que tenemos acceso a internet)
  33. 33. Créditos: Frank Wierzbicki
  34. 34. Web
  35. 35. Demo con Django
  36. 36. Y sólo por diversión...
  37. 37. ### 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')
  38. 38. Créditos: Jacob Kaplan-Moss
  39. 39. Testing http://www.flickr.com/photos/emotionaltoothpaste/26034597/
  40. 40. DocTests
  41. 41. 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
  42. 42. Demo de (ab)uso de DocTest
  43. 43. ¿Por cierto, quien más usa Jython?
  44. 44. EADS http://www.flickr.com/photos/nguyendai/694158734/
  45. 45. Lockheed Martin http://www.flickr.com/photos/rcsj/2504022678/
  46. 46. ¿Y dónde puedo aprender más?
  47. 47. jythonbook.com
  48. 48. ¿Preguntas? Contacto: @leosoto http://blog.leosoto.com
  49. 49. ¡Gracias! Contacto: @leosoto http://blog.leosoto.com

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