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本文實例講述了Python修改MP3文件的方法。分享給大家供大家參考。具體如下：

用這個程序修改后的MP3比原來要小一些了，因為一張圖片被刪除了，起到了給MP3"瘦身"的作用。在一些mp3中，每個都有一張400多K的圖片，10幾個MP3，就相當一個普通MP3文件的大小了。

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									# -*- coding: cp936 -*-

									"""

									將MP3文件中的ID3V2.3部分去掉,以便在MP3機上播放

									用法：mp3lcear [源mp3目錄] [生成的mp3目錄]

									"""

									import sys

									import os

									import string

									import shutil

									import struct

									import thread

									import threading

									import time

									mp3suffix = 'mp3'

									class Process(threading.Thread):

									"""

									簡單地在運行的過程中顯示進度

									"""

									def __init__(self,msg,sleepTime):

									threading.Thread.__init__(self)

									self.msg = msg

									self.running = True

									self.sleepTime = sleepTime

									def setPause(self,pause):

									self.pause = pause

									def setRunning(self,running):

									self.running = running

									def run (self):

									while(self.running):

									self.pause.wait()

									print self.msg,

									time.sleep(self.sleepTime)

									def usage(code, msg=''):

									"""

									程序的使用方法

									"""

									print >> sys.stderr, __doc__

									if msg:

									print >> sys.stderr, msg

									sys.exit(code)

									def checkDir(argDir,create=False):

									"""

									檢查目錄是否存在,如果create為Ture,則新建一個目錄

									"""

									tempDir = None

									if(not os.path.isdir(argDir)):

									currentDir = os.path.abspath(os.curdir)

									tempDir = os.path.join(currentDir,argDir)

									if(not os.path.isdir(tempDir) and create):

									os.mkdir(tempDir)

									else:

									usage(1,"目錄"+argDir+"不存在")

									else:

									tempDir = os.path.abspath(argDir)

									return tempDir

									def clearMp3(srcFile,destFile):

									"""

									修改mp3文件，并將其創建到destFile所指定的地址

									"""

									global process

									srcfp = None

									filesize = os.path.getsize(srcFile)

									try:

									srcfp = open(srcFile,'rb')

									head = srcfp.read(3)

									if(head=='ID3'):

									srcfp.seek(3,1)

									size = srcfp.read(4)

									if(not len(size)==4):

									print srcFile+'文件格式錯誤'

									else:

									size0 = struct.unpack('b',size[0])[0]

									size1 = struct.unpack('b',size[1])[0]

									size2 = struct.unpack('b',size[2])[0]

									size3 = struct.unpack('b',size[3])[0]

									headSize =(((size0&0x7f)<<21) | ((size1&0x7f)<<14) | ((size2&0x7f)<<7) | (size3&0x7f))

									filesize = filesize - headSize

									destfp = None

									try:

									dataLen = 0

									destfp = open(destFile,'wb')

									srcfp.seek(headSize,1)

									data=srcfp.read(1024)

									while (data!= ''):

									destfp.write(data)

									data=srcfp.read(1024)

									except Exception,e:

									print '創建文件'+destFile+'錯誤',e

									try:

									if (destfp != None):

									destfp.close

									except Exception,de:

									print de

									else:

									print srcFile+'不需要修改 拷貝',

									try:

									shutil.copyfile(srcFile,destFile)

									except Exception, ce:

									print ce

									except Exception,oe:

									print '修改中出錯',oe

									try:

									if (srcfp != None):

									srcfp.close()

									except Exception,se:

									print de

									if __name__ == "__main__":

									if(len(sys.argv)<3):

									usage(1)

									global process

									sourceDir = checkDir(sys.argv[1])

									destDir = checkDir(sys.argv[2],True)

									print 'Mp3源目錄',sourceDir

									print 'Mp3目的目錄',destDir

									process = Process('...',1)

									pause = threading.Event()

									process.setPause(pause)

									process.start()

									for filename in os.listdir(sourceDir):

									srcPath = os.path.join(sourceDir, filename)

									destPath = os.path.join(destDir, filename)

									if os.path.isfile(srcPath):

									print '開始處理 '+filename,

									tempfilename = filename.lower()

									if(not tempfilename.endswith(mp3suffix)):

									print filename+'不是一個mp3文件\n'

									else:

									pause.set()

									clearMp3(srcPath,destPath)

									pause.clear()

									print '結束 \n'

									pause.set()

									process.running = False

									sys.exit(0)