title: How to get method parameter names?
body: <p>Given the Python function:</p>
  
  <pre><code>def a_method(arg1, arg2):
      pass
  </code></pre>
  
  <p>How can I extract the number and names of the arguments. I.e., given that I have a reference to <code>func</code>, I want the <code>func.[something]</code> to return <code>("arg1", "arg2")</code>.</p>
  
  <p>The usage scenario for this is that I have a decorator, and I wish to use the method arguments in the same order that they appear for the actual function as a key. I.e., how would the decorator look that printed <code>"a,b"</code> when I call <code>a_method("a", "b")</code>?</p>