title: python os.command prints value on the console
body: <pre><code>for i in default_proxy_config_data:
          command = "command get %s" % i
          actual_ats_value = os.system(command)
  </code></pre>
  
  <p>I was expecting that the variable will get the output of the command.
  But when i ran the script, it prints the value of the command.</p>
  
  <pre><code>config.exec_thread.limit: 2
  config.exec_thread.autoconfig: 1
  config.accept_threads: 1
  </code></pre>