title: How to get the system info with Python?
body: <p>I need to get the info under what environment the software is running. 
  Does python have a library for this purpose?</p>
  
  <p>I want to know the following info.</p>
  
  <ul>
  <li>OS name/version</li>
  <li>Name of the CPU, clock speed</li>
  <li>Number of CPU core</li>
  <li>Size of memory </li>
  </ul>