code: def get_free_memory():
      
      if 'win32' in sys.platform:
          # windows
          return get_free_memory_win()
      elif 'linux' in sys.platform:
          # linux
          return get_free_memory_linux()
      elif 'darwin' in sys.platform:
          # mac
          return get_free_memory_osx()
docs: Return current free memory on the machine.
  
      Currently supported for Windows, Linux, MacOS.
  
      :returns: Free memory in MB unit
      :rtype: int