Cross-platform gui toolkit for deploying Python applications

Question

Building on: http://www.reddit.com/r/Python/comments/7v5ra/whats_your_favorite_gui_toolkit_and_why/

Merits:

1 - ease of design / integration - learning curve

Answer 1

Jython.

Jython is an implementation of the high-level, dynamic, object-oriented language Python written in 100% Pure Java, and seamlessly integrated with the Java platform. It thus allows you to run Python on any Java platform.

You can use either Swing, Applet, or other GUI frameworks available to Java platform. See Java Tutorials for Graphical User Interfaces and 2D Graphics. There are plenty of books and documentation such as API reference.

Here's a Hello world Swing application from An Introduction to Jython.

from javax.swing import *

frame = JFrame("Hello Jython")
label = JLabel("Hello Jython!", JLabel.CENTER)
frame.add(label)
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)
frame.setSize(300, 300)
frame.show()

Here's a Jython applet by Todd Ditchendorf that demonstrates multi-threaded particle drawing (60 lines).

from __future__ import nested_scopes
import java.lang as lang
import java.util as util
import java.awt as awt
import javax.swing as swing

class Particle:

    def __init__(self,initX,initY):
    self.x = initX
    self.y = initY
    self.rng = util.Random()

    def move(self):
    self.x += self.rng.nextInt(10) - 5
    self.y += self.rng.nextInt(20) - 10

    def draw(self,g2):
    g2.drawRect(self.x,self.y,10,10)

class ParticleCanvas(awt.Canvas):

    def __init__(self,newSize):
    awt.Canvas.__init__(self,size=(newSize,newSize))

    def paint(self,g2):
    for p in self.particles:
        p.draw(g2)

class ParticleApplet(swing.JApplet):

    def init(self):
    self.canvas = ParticleCanvas(self.getWidth())
    self.contentPane.add(self.canvas)

    def start(self):
    n = 10
    particles = []
    for i in range(n):
        particles.append(Particle(150,150))
    self.canvas.particles = particles

    self.threads = []
    for i in range(n):
        self.threads.append(self.makeThread(particles[i]))
        self.threads[i].start()

    def makeThread(self,p):

    class MyRunnable(lang.Runnable):
        def run(this):
        try:
            while 1:
            p.move()
            self.canvas.repaint()
            lang.Thread.sleep(100)
        except lang.InterruptedException:
            return

    return lang.Thread(MyRunnable())

If you are just interested in drawing lines and circles you can probably cut it down to half.