You should install python 3.6 version because python 3.7 version doesn't support pyaudio
1 step : Then download the .whl file
according to your python version and the configuration of your machine in your python folder which is newly installed. For me it is python 3.6 and 64 bit machine. Download the file from here
(https://www.lfd.uci.edu/~gohlke/pythonlibs/)
2 step : run your cmd and type " pip install your downloaded file name here "