Audio Slicing in python

Divide the audio file into no of sample by time interval and then play.

 import wave  
 import pygame  
 import time  
 import sys  
 def slice(infile, outfilename, start_ms, end_ms):  
   width = infile.getsampwidth() #Returns sample width in bytes  
   rate = infile.getframerate() #Returns sampling frequency  
   fpms = rate / 1000 # frames per ms  
   length = (end_ms - start_ms) * fpms  
   start_index = start_ms * fpms  
   out = wave.open(outfilename, "w")  
   out.setparams((infile.getnchannels(), width, rate, length, infile.getcomptype(), infile.getcompname()))  
   infile.rewind()       #Rewind the file pointer to the beginning of the audio stream  
   anchor = infile.tell()   #Return current file pointer position  
   infile.setpos(anchor + start_index) #Set the file pointer to the specified position  
   out.writeframes(infile.readframes(length)) #Write audio frames and make sure nframes is correct  
 if __name__ == "__main__":  
   slice(wave.open("song1.wav", "r"), "out.wav", int(sys.argv[1]), int(sys.argv[2]))  
   pygame.mixer.init()  
   pygame.mixer.music.load("out.wav")  
   pygame.mixer.music.play()  
   while pygame.mixer.music.get_busy() == True:  
     continue