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from tkinter import *
import pygame.mixer

app = Tk()
app.title("Head First Mix")


sound_file = "50459_M_RED_Nephlimizer.wav"
mixer = pygame.mixer
mixer.init()

def track_start():
    track.play(loops = -1)

def track_stop():
    track.stop()

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

def track_toogle():
    if track_playing.get() == 1:
        track_start()
    else:
        track_stop()

def change_volume(v):

    track.set_volume(volume.get())



track_playing = IntVar()

track = mixer.Sound(sound_file)

track_button = Checkbutton(app,
                           variable = track_playing,
                           command = track_toogle,
                           text = "50459_M_RED_Nephlimizer.wav")


track_button.pack(side = LEFT)

volume = DoubleVar()

volume.set(track.get_volume())

volume_scale = Scale(app,
                     variable = volume,
                     from_ = 0.0,
                     to = 1.0,
                     resolution = 0.1,
                     command = change_volume,
                     label = "Volume",
                     orient = HORIZONTAL)

volume_scale.pack(side = RIGHT)

app.protocol("WM_DELETE_WINDOW", shutdown)

app.mainloop()

目前，我读了一本名为 head first python 的书。在读到第 9 章之前，我什么都懂

为什么我需要“v” - def change_volume(v)：

顺便说一句，让您停止、启动和调整曲目的音量

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1 回答 1

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编码

def change_volume(v):

    track.set_volume(volume.get())

被写为需要一个参数v。但是，正如所写，它从未实际使用过该参数。相反，由于您volume = track.get_volume()在代码的其他地方调用，除非您在其他地方修改volume（或轨道音量的值），否则您的代码实际上等效于

def change_volume(v):

    track.set_volume(track.get_volume())

如果要实际改变值，需要使用参数的值来设置音量：

def change_volume(v):

    track.set_volume(v.get())
于 2013-08-29T19:53:19.183 回答