This is a project on 'Music Player using Python' Can you please add a next and a previous button to this code:

import os

import threading

import time

import tkinter.messagebox

from tkinter import *

from tkinter import filedialog

from tkinter import ttk

from ttkthemes import themed_tk as tk

from mutagen.mp3 import MP3

from pygame import mixer

root = tk.ThemedTk()

root.get_themes() # Returns a list of all themes that can be set

root.set_theme("radiance") # Sets an available theme

# Fonts - Arial (corresponds to Helvetica), Courier New (Courier), Comic Sans MS, Fixedsys,

# MS Sans Serif, MS Serif, Symbol, System, Times New Roman (Times), and Verdana

#

# Styles - normal, bold, roman, italic, underline, and overstrike.

statusbar = ttk.Label(root, text="Welcome to Melody", relief=SUNKEN, anchor=W, font='Times 10 italic')

statusbar.pack(side=BOTTOM, fill=X)

# Create the menubar

menubar = Menu(root)

root.config(menu=menubar)

# Create the submenu

subMenu = Menu(menubar, tearoff=0)

playlist = []

# playlist - contains the full path + filename

# playlistbox - contains just the filename

# Fullpath + filename is required to play the music inside play_music load function

def browse_file():

global filename_path

filename_path = filedialog.askopenfilename()

add_to_playlist(filename_path)

mixer.music.queue(filename_path)

def add_to_playlist(filename):

filename = os.path.basename(filename)

index = 0

playlistbox.insert(index, filename)

playlist.insert(index, filename_path)

index += 1

menubar.add_cascade(label="File", menu=subMenu)

subMenu.add_command(label="Open", command=browse_file)

subMenu.add_command(label="Exit", command=root.destroy)

def about_us():

tkinter.messagebox.showinfo('About Melody', 'This is a music player build using Python Tkinter by @ishandandriyal')

subMenu = Menu(menubar, tearoff=0)

menubar.add_cascade(label="Help", menu=subMenu)

subMenu.add_command(label="About Us", command=about_us)

mixer.init() # initializing the mixer

root.title("Melody")

root.iconbitmap(r'images/fav.ico')

# Root Window - StatusBar, LeftFrame, RightFrame

# LeftFrame - The listbox (playlist)

# RightFrame - TopFrame,MiddleFrame and the BottomFrame

leftframe = Frame(root)

leftframe.pack(side=LEFT, padx=30, pady=30)

playlistbox = Listbox(leftframe)

playlistbox.pack()

addBtn = ttk.Button(leftframe, text="+ Add", command=browse_file)

addBtn.pack(side=LEFT)

def del_song():

selected_song = playlistbox.curselection()

selected_song = int(selected_song[0])

playlistbox.delete(selected_song)

playlist.pop(selected_song)

delBtn = ttk.Button(leftframe, text="- Del", command=del_song)

delBtn.pack(side=LEFT)

rightframe = Frame(root)

rightframe.pack(pady=30)

topframe = Frame(rightframe)

topframe.pack()

lengthlabel = ttk.Label(topframe, text='Total Length : --:--')

lengthlabel.pack(pady=5)

currenttimelabel = ttk.Label(topframe, text='Current Time : --:--', relief=GROOVE)

currenttimelabel.pack()

def show_details(play_song):

file_data = os.path.splitext(play_song)

if file_data[1] == '.mp3':

audio = MP3(play_song)

total_length = audio.info.length

else:

a = mixer.Sound(play_song)

total_length = a.get_length()

# div - total_length/60, mod - total_length % 60

mins, secs = divmod(total_length, 60)

mins = round(mins)

secs = round(secs)

timeformat = '{:02d}:{:02d}'.format(mins, secs)

lengthlabel['text'] = "Total Length" + ' - ' + timeformat

t1 = threading.Thread(target=start_count, args=(total_length,))

t1.start()

def start_count(t):

global paused

# mixer.music.get_busy(): - Returns FALSE when we press the stop button (music stop playing)

# Continue - Ignores all of the statements below it. We check if music is paused or not.

current_time = 0

while current_time <= t and mixer.music.get_busy():

if paused:

continue

else:

mins, secs = divmod(current_time, 60)

mins = round(mins)

secs = round(secs)

timeformat = '{:02d}:{:02d}'.format(mins, secs)

currenttimelabel['text'] = "Current Time" + ' - ' + timeformat

time.sleep(1)

current_time += 1

def play_music():

global paused

if paused:

mixer.music.unpause()

statusbar['text'] = "Music Resumed"

paused = FALSE

else:

try:

stop_music()

time.sleep(1)

selected_song = playlistbox.curselection()

selected_song = int(selected_song[0])

play_it = playlist[selected_song]

mixer.music.load(play_it)

mixer.music.play()

statusbar['text'] = "Playing music" + ' - ' + os.path.basename(play_it)

show_details(play_it)

except:

tkinter.messagebox.showerror('File not found', 'Melody could not find the file. Please check again.')

def stop_music():

mixer.music.stop()

statusbar['text'] = "Music Stopped"

paused = FALSE

def pause_music():

global paused

paused = TRUE

mixer.music.pause()

statusbar['text'] = "Music Paused"

def rewind_music():

play_music()

statusbar['text'] = "Music Rewinded"

def set_vol(val):

volume = float(val) / 100

mixer.music.set_volume(volume)

# set_volume of mixer takes value only from 0 to 1. Example - 0, 0.1,0.55,0.54.0.99,1

muted = FALSE

def mute_music():

global muted

if muted: # Unmute the music

mixer.music.set_volume(0.7)

volumeBtn.configure(image=volumePhoto)

scale.set(70)

muted = FALSE

else: # mute the music

mixer.music.set_volume(0)

volumeBtn.configure(image=mutePhoto)

scale.set(0)

muted = TRUE

middleframe = Frame(rightframe)

middleframe.pack(pady=30, padx=30)

playPhoto = PhotoImage(file='images/002-play.png')

playBtn = ttk.Button(middleframe, image=playPhoto, command=play_music)

playBtn.grid(row=0, column=0, padx=10)

stopPhoto = PhotoImage(file='images/003-stop-button.png')

stopBtn = ttk.Button(middleframe, image=stopPhoto, command=stop_music)

stopBtn.grid(row=0, column=1, padx=10)

pausePhoto = PhotoImage(file='images/001-pause-button.png')

pauseBtn = ttk.Button(middleframe, image=pausePhoto, command=pause_music)

pauseBtn.grid(row=0, column=2, padx=10)

# Bottom Frame for volume, rewind, mute etc.

bottomframe = Frame(rightframe)

bottomframe.pack()

rewindPhoto = PhotoImage(file='images/rwnd.png')

rewindBtn = ttk.Button(bottomframe, image=rewindPhoto, command=rewind_music)

rewindBtn.grid(row=0, column=0)

mutePhoto = PhotoImage(file='images/002-volume.png')

volumePhoto = PhotoImage(file='images/001-volume-button.png')

volumeBtn = ttk.Button(bottomframe, image=volumePhoto, command=mute_music)

volumeBtn.grid(row=0, column=1)

scale = ttk.Scale(bottomframe, from_=0, to=100, orient=HORIZONTAL, command=set_vol)

scale.set(70) # implement the default value of scale when music player starts

mixer.music.set_volume(0.7)

scale.grid(row=0, column=2, pady=15, padx=30)

def on_closing():

stop_music()

root.destroy()

root.protocol("WM_DELETE_WINDOW", on_closing)

root.mainloop()