[Python] How to properly install PyAudio for the latest version of Python?

I was using speech_recognition with the latest version of Python (3.9). And for some reason, pip did not (still does not) allow me to install pyaudio.

sample of the error message:

_portaudiomodule.c
c:\program files\python39\include\pyconfig.h(117): warning C4005: 'MS_WIN64': macro redefinition
src/_portaudiomodule.c: note: see previous definition of 'MS_WIN64'
src/_portaudiomodule.c(29): fatal error C1083: Cannot open include file: 'portaudio.h': No such file or directory
error: command 'C:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\BuildTools\\VC\\Tools\\MSVC\\14.16.27023\\bin\\HostX86\\x64\\cl.exe' failed with exit code 2
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It has been meaningless for me to look for what portaudio.h does. Here is the solution. I hope you don't waste your time like I did.

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