import os

import urllib2

import json

import base64  

Api_Key = "***"  

Secrect_Key = "***" 

url = 'https://openapi.baidu.com/oauth/2.0/token?grant_type=client_credentials&client_id='+Api_Key+'&client_secret='+Secrect_Key

res = urllib2.urlopen(url).read()

data = json.loads(res)

token = data['access_token']    #获取的token

print 'token获取成功：'+`token`

VOICE_RATE = 8000

WAVE_FILE = './data/voice2250102769878738808.wav'

USER_ID = "***"

WAVE_TYPE = 'wav'

#其它参数可参考sdk文档

f = open(WAVE_FILE,'r')

speech = base64.b64encode(f.read())

size = os.path.getsize(WAVE_FILE)

update = json.dumps({'format':WAVE_TYPE,'rate':VOICE_RATE,'channel':1,'cuid':USER_ID,'token':token,'speech':speech,'len':size})

url1="http://vop.baidu.com/server_api"

r = urllib2.urlopen(url1,update)

t = r.read()

result = json.loads(t)

print result

if result['err_msg']=='success.':

    word = result['result'][0].encode('utf-8')

    if word!='':

        if word[len(word)-3:len(word)]=='，':

            print word[0:len(word)-3]

            print word[0:len(word)-3]

        else:

            print word

    else:

        print "音频文件不存在或格式错误"

else:

    print "错误"

代码如上，语音文件是微信的语音文件，文件格式为WAV，请问为什么会说我参数中的语音参数错误？

ps:我用python通过微信获取语音的api webwxgetvoice获取的语音，直接将文件格式改成了wav,在本地能播放。

谢谢好心人