如何在不写入文件的情况下将pyaudio帧转换为wav格式？

Question

我想使用pyaudio和IBM Bluemix服务实现简单的语音到文本工具。目前我需要录制音频，将其保存到磁盘，然后再次加载，以便将其发送到Bluemix。

RATE=44100
RECORD_SECONDS = 10
CHUNKSIZE = 1024

# initialize portaudio
p = pyaudio.PyAudio()
stream = p.open(format=pyaudio.paInt16, channels=1, rate=RATE,     input=True, frames_per_buffer=CHUNKSIZE)

frames = [] # A python-list of chunks(numpy.ndarray)
print("Please speak!")

for _ in range(0, int(RATE / CHUNKSIZE * RECORD_SECONDS)):
    data = stream.read(CHUNKSIZE)
    frames.append(np.fromstring(data, dtype=np.int16))

#Convert the list of numpy-arrays into a 1D array (column-wise)
numpydata = np.hstack(frames)

# close stream
stream.stop_stream()
stream.close()
p.terminate()

# save audio to disk
wav.write('out.wav',RATE,numpydata)

# Open audio file(.wav) in wave format 
audio = open('/home/dolorousrtur/Documents/Projects/Capstone/out.wav', 'rb') 

# send audio to bluemix service
headers={'Content-Type': 'audio/wav'} 
r = requests.post(url, data=audio, headers=headers, auth=(username, password)) 

如何将pyaudio帧转换为wav格式而不将其写入磁盘？