title: What's a good equivalent to subprocess.check_call that returns the contents of stdout?
body: <p>I'd like a good method that matches the interface of <code>subprocess.check_call</code> -- ie, it throws <code>CalledProcessError</code> when it fails, is synchronous, &amp;c -- but instead of returning the return code of the command (if it even does that) returns the program's output, either only stdout, or a tuple of (stdout, stderr).</p>
  
  <p>Does somebody have a method that does this?</p>