我能够生成一个wav文件的“玛丽有一个小羊羔”使用下面的代码。但是当我试图生成一个mp3时，它失败了。

#https://learn.microsoft.com/en-us/azure/cognitive-services/speech-service/get-started-text-to-speech?tabs=script%2Cwindowsinstall&pivots=programming-language-python
import azure.cognitiveservices.speech as speechsdk
languageCode = 'en-US'
ssmlGender = 'MALE'
voicName = 'en-US-JennyNeural'
speakingRate = '-5%'
pitch = '-10%'
voiceStyle = 'newscast'
azureKey = 'FAKE KEY'
azureRegion = 'FAKE REGION'
#############################################################
#audioOuputFile = './audioFiles/test.wav'
audioOuputFile = './audioFiles/test.mp3'
#############################################################
txt = 'Mary had a little lamb it\'s fleece was white as snow.'
txt+= 'And everywhere that Mary went, the lamb was sure to go,'
txt+= 'It followed her to school one day,'
txt+= 'That was against the rule,'
txt+= 'It made the children laugh and play,'
txt+= 'To see a lamb at school.'
head1 = f'<speak xmlns="http://www.w3.org/2001/10/synthesis" xmlns:mstts="http://www.w3.org/2001/mstts" xmlns:emo="http://www.w3.org/2009/10/emotionml" version="1.0" xml:lang="{languageCode}">'
head2 = f'<voice name="{voicName}">'
head3 =f'<mstts:express-as style="{voiceStyle}">'
head4 = f'<prosody rate="{speakingRate}" pitch="{pitch}">'
tail= '</prosody></mstts:express-as></voice></speak>'
ssml = head1 + head2 + head3 + head4 + txt + tail
print('this is the ssml======================================')
print(ssml)
print('end ssml======================================')
print()
speech_config = speechsdk.SpeechConfig(subscription=azureKey, region=azureRegion)
audio_config = speechsdk.AudioConfig(filename=audioOuputFile)
#HERE IS THE PROBLEM
#Without this statement everything works fine
#Can produce a wav file 
speech_config.set_speech_synthesis_output_format(SpeechSynthesisOutputFormat["Audio16Khz128KBitRateMonoMp3"])
synthesizer = speechsdk.SpeechSynthesizer(speech_config=speech_config, audio_config=audio_config)
synthesizer.speak_ssml_async(ssml)

以下是控制台输出：

(埃沃) D:\py_new\tts>python ttsTest3.py这是ssml====================================== 玛丽有一只小羊羔，它的羊毛是白色的，因为snow.And到处都是玛丽去的地方，羊羔肯定要去，有一天它跟着她去上学，这违反了规则，它让孩子们笑着玩，在学校看到一只小羊羔。ssml======================================

speech_config.set_speech_synthesis_output_format(SpeechSynthesisOutputFormat"Audio16Khz128KBitRateMonoMp3") NameError: name 'SpeechSynthesisOutputFormat‘中的文件"D:\py_new\tts\ttsTest3.py"，第45行

(envo) D:\py_new\tts>

注意错误: NameError:未定义名称'SpeechSynthesisOutputFormat‘

与： 自定义音频格式 进行比较

在：

https://learn.microsoft.com/en-us/azure/cognitive-services/speech-service/get-started-text-to-speech?tabs=script%2Cwindowsinstall&pivots=programming-language-python

在Nodejs中，这一切都很好。但是我也需要能够用Python来完成这个任务。