title: deliberately Raise and throw an exception in python
body: <p>I have a use case where I need to raise an exception and again throw the exception. For this I'm using raise keyword in both <strong>try</strong> and <strong>catch</strong>. The code is as below</p>
  
  <pre><code>try:
      username = input ("username:")
      If Len(username) != 6:
          raise Exception
  except Exception:
      raise Exception ("username is not valid")
  </code></pre>
  
  <p>Is this the right way to do like this? Is it compliant to coding standards to raise Exception in both <code>try</code> and <code>except</code> blocks?</p>