Python - Custom Widgets and Classes: With an object in mind(class, methods, self)

Head First Programming
A learner's guide to programming
using the Python language
( O'Reilly Media)
David Griffiths (著) Paul Barry (著)

開発環境

• OS X Mavericks - Apple(OS)
• Emacs (CUI)、BBEdit - Bare Bones Software, Inc. (GUI) (Text Editor)
• Python (プログラミング言語)

Head First Programming A learner's guide to programming using the Python language (David Griffiths(著)、Paul Barry(著)、 O'Reilly Media )のChapter 11(Custom Widgets and Classes: With an object in mind)、CODE MAGNETS(p.371)を解いてみる。

CODE MAGNETS(p.371)

コード(BBEdit)

sample371.py

#!/usr/bin/env python2.7
#-*- coding: utf-8 -*-

# python3.xではtkinter, python2.xではTkinter
# python3.xでpygame.mixerモジュールを上手くインストールできてないので2.7を使用
from Tkinter import *
import pygame.mixer

class SoundPanel(Frame):
    def __init__(self, app, mixer, sound_file):
        Frame.__init__(self, app)
        self.track = mixer.Sound(sound_file)
        self.track_playing = IntVar()
        track_button = Checkbutton(self,
                                   variable=self.track_playing,
                                   command=self.trackToggle,
                                   text=sound_file)
        track_button.pack(side=LEFT)
        self.volume = DoubleVar()
        volume_scale = Scale(self,
                             variable = self.volume,
                             from_ = 0.0,
                             to = 1.0,
                             resolution = 0.1,
                             command = self.changeVolume,
                             label = 'Volume',
                             orient = HORIZONTAL)
        volume_scale.pack(side=RIGHT)

    def trackToggle(self):
        if self.track_playing.get() == 1:
            self.track.play(loops=-1)
        else:
            self.track.stop()
    def changeVolume(self, a):
        self.track.set_volume(self.volume.get())

test_sample371.py

#!/usr/bin/env python2.7
#-*- coding: utf-8 -*-

# python3.xではtkinter, python2.xではTkinter
# python3.xでpygame.mixerモジュールを上手くインストールできてないので2.7を使用
from Tkinter import *
import pygame.mixer
import sample371

def shutdown():
    mixer.stop()
    app.destroy()

app = Tk()
app.title('Head First Mix')
mixer = pygame.mixer
mixer.init()

sound_files = ['39147_M_RED_beep_line.wav',
               '39484__M_RED__trance_trumpet_loop.wav',
               '39607__M_RED__trumpet_delay_loop.wav',
               '41722__M_RED__happy_freaq.wav',
               '45414_M_RED_Trance_Train.wav',
               '49119_M_RED_HardBouncer.wav',
               '50459_M_RED_Nephlimizer.wav',
               '50848_M_RED_WaveBaseLoop.wav',
               '59264_M_RED_TheDreamDrums.wav']
          
for sound_file in sound_files:
    panel = sample371.SoundPanel(app, mixer, sound_file)
    panel.pack()

app.protocol('WM_DELETE_WINDOW', shutdown)

app.mainloop()

入出力結果(Terminal)

$ ./test_sample371.p
$