Doubt in Python code using Tkinter

Question

I’m reading Head First Programming in Python and presented the following error in the execution of a proposed program:

Traceback (most recent call last):
  
File "E:\Desktop\python\teste20_Classe_tkinter.py", line 12, in <module>
    panel = SoundPanel(app,mixer,"50459_M_RED_Nephlimizer.wav").pack()
TypeError: __init__() takes from 1 to 3 positional arguments but 4 were given

The code is this:

from tkinter import*
from SoundPanel import*
import pygame.mixer

app = Tk()
app.title("Mix de Sons")


mixer = pygame.mixer
mixer.init()

panel = SoundPanel(app,mixer,"50459_M_RED_Nephlimizer.wav").pack()
panel = SoundPanel(app,mixer,"49119_M_RED_HardBouncer.wav").pack()

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

app.protocol("WM_DELETE_WINDOW",shutdown)

app.mainloop()

Class code:

from tkinter import*
import pygame.mixer

class SoundPanel(Frame):

def _init_(self,app,mixer,arq_som):

    Frame._init_(self,app)
    self.trilha = mixer.Sound(arq_som)
    self.tocar_trilha = IntVar()

    botão_trilha = Checkbutton(self,variable = self.tocar_trilha,command = self.Play_Stop,text = arq_som)
    botão_trilha.pack(side = LEFT)

    self.volume = DoubleVar()
    self.volume.set(trilha.get_volume())

    volume_scale = Scale(self,variable = self.volume,from_ = 0.0,to = 1.0,resolution = 0.1,command = self.muda_volume,label = "Volume",orient = HORIZONTAL)
    volume_scale.pack(side = RIGHT)


def Play_Stop(self):
    if self.tocar_trilha.get() == 1:
        self.trilha.play(loops = -1)
    else:

        self.trilha.stop()
        
def muda_volume(self,v):
    self.trilha.set_volume(self.volume.get())

Answer 1

There were several minor errors in code and indentation

Class code:

from tkinter import*
import pygame.mixer

class SoundPanel(Frame):

    def __init__(self,app,mixer,arq_som):

        Frame.__init__(self,app)
        self.trilha = mixer.Sound(arq_som)
        self.tocar_trilha = IntVar()

        botão_trilha = Checkbutton(self,variable = self.tocar_trilha,command = self.Play_Stop,text = arq_som)
        botão_trilha.pack(side = LEFT)

        self.volume = DoubleVar()
        self.volume.set(self.trilha.get_volume())

        volume_scale = Scale(self,variable = self.volume,from_ = 0.0,to = 1.0,resolution = 0.1,command = self.muda_volume,
                             label = "Volume",orient = HORIZONTAL)
        volume_scale.pack(side = RIGHT)


    def Play_Stop(self):
        if self.tocar_trilha.get() == 1:
            self.trilha.play(loops = -1)
        else:
            self.trilha.stop()
        
    def muda_volume(self,v):
        self.trilha.set_volume(self.volume.get())  

The code is this:

from tkinter import *
import pygame.mixer

app = Tk()
app.title("Mix de Sons")


mixer = pygame.mixer
mixer.init()

panel = SoundPanel(app,mixer,"50459_M_RED_Nephlimizer.wav")
panel.pack()
panel = SoundPanel(app,mixer,"49119_M_RED_HardBouncer.wav")
panel.pack()

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

app.protocol("WM_DELETE_WINDOW",shutdown)

app.mainloop()

I used Anaconda so the classes were in the same document, you will need to import if use in separate files.

I modified of :

panel = SoundPanel(app,mixer,"50459_M_RED_Nephlimizer.wav").pack()
panel = SoundPanel(app,mixer,"49119_M_RED_HardBouncer.wav").pack())

for:

panel = SoundPanel(app,mixer,"50459_M_RED_Nephlimizer.wav")
panel.pack()
panel = SoundPanel(app,mixer,"49119_M_RED_HardBouncer.wav")
panel.pack()

---

of:

def _init_(self,app,mixer,arq_som):

    Frame._init_(self,app)

for:

    def __init__(self,app,mixer,arq_som):

        Frame.__init__(self,app)

---

of:

self.volume.set(trilha.get_volume())

for:

self.volume.set(self.trilha.get_volume())

Upshot: