How to get current CPU and RAM usage in Python?

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How can I get the current system status (current CPU, RAM, free disk space, etc.) in Python? Ideally, it would work for both Unix and Windows platforms.

There seems to be a few possible ways of extracting that from my search:

  1. Using a library such as PSI (that currently seems not actively developed and not supported on multiple platforms) or something like pystatgrab (again no activity since 2007 it seems and no support for Windows).

  2. Using platform specific code such as using a os.popen("ps") or similar for the *nix systems and MEMORYSTATUS in ctypes.windll.kernel32 (see this recipe on ActiveState) for the Windows platform. One could put a Python class together with all those code snippets.

It’s not that those methods are bad but is there already a well-supported, multi-platform way of doing the same thing?

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