Python Music Player

Music_Player.py

from tkinter import *
from tkinter.filedialog import askopenfile 
from pygame import mixer

file_name = ""

window=Tk()
window.title("Music Player")
window.geometry("650x400")

def open_file(): 
    file = askopenfile(mode ='r', filetypes =[('Music Files', '*.mp3')]) 
    global file_name
    file_name = file.name

def play():  
    try:
        mixer.init()
        mixer.music.load(file_name)
        mixer.music.set_volume(0.5)                         #For Playing The Audio
        mixer.music.play()
    except:
        root_window = Tk()
        root_window.title("Error")
        root_window.geometry("40x100")
        w = Label(root_window, text=" Error !! Choose a Song")
        w.grid(column=1,row=1)
        w.pack()
        root_window.mainloop()

def Pause():                          #For Pausing The Audio
    mixer.music.pause()

def UnPause():                        #For Unpausing The Audio
    mixer.music.unpause()

def stop():                           #To Stop The Song
    mixer.music.stop()

btn=Button(window,text="              Stop The Song         ",command=stop)
btn.grid(column=0,row=2)

btn=Button(window,text="              Start To Play         ",command=play)
btn.grid(column=1,row=2)   

btn=Button(window,text="            Pause The Song          ",command=Pause)
btn.grid(column=2,row=2)

btn=Button(window,text="            UnPause The Song        ",command=UnPause)
btn.grid(column=3,row=2)

btn=Button(window,text="            Choose File             ",command=open_file)
btn.grid(column=2,row=0)

window.mainloop()