需要到 百度智能云 申请测试账号，获得相关的 

APP_ID, API_KEY, SECRET_KEY

相关的使用说明可查看文档

pip install baidu_aip

from aip import AipSpeech


client = AipSpeech(APP_ID, API_KEY, SECRET_KEY)

def speech_recognize(file):
    data = open(file, "rb").read()
    # 文件，文件格式，采样频率，PID(语音种类)
    result = client.asr(data, "wav", 16000, {"dev_id": 1537})
    return result["result"]

print(speech_recognize("audio.wav"))