title: python - Get input argument's name of function
body: <p>How can I get name of input argument in function?</p>
  <p>Here is example</p>
  <pre><code>a=1
  b=2
  c=3
  def test(x):
      print(?)
  
  test(b)
  </code></pre>
  <p>and result should be</p>
  <pre><code>b
  </code></pre>
  <p>I think this is easy problem...? But not to me :)</p>