title: Python error with try-within try-else block
body: <p>I have a script that needs to use a slightly unusual try structure, of the general form:</p>
  <pre><code>   try:
        # Try to get object 1 (may or may not exist)
     except:
        # Try to get object 2 (may or may not exist)
     else:
        try:
           # Try to append object 2 (which may not exist) to object 1, which has been retrieved already
     
     # Do stuff with the retrieved object/composite object
  </code></pre>
  <p>I always get an 'unexpected indent' error at the last section (where I try to do stuff with my retrieved object), unless I put a dummy finally block in:</p>
  <pre><code>   try:
        # Try to get object 1 (may or may not exist)
     except:
        # Try to get object 2 (may or may not exist)
     else:
        try:
           # Try to append object 2 (which may not exist) to object 1, which has been retrieved already
        finally:
           dummy = 1
  
     # Do stuff with the retrieved object/composite object
  </code></pre>
  <p>There is zero point to setting dummy = 1, other than that it seems to work. Is this expected behaviour? Is it possible to use such a nest (or alternative syntax) without resorting to dummy lines of code!?</p>
  <p>Finally, in one place where I do this, there is an additional line of code that is <em>only</em> required if the second 'try' statement executes without exception, but there seems to be no way of making this work elegantly with an 'else' clause on the inner/second 'try'. The following gives an 'invalid syntax' error on the second 'else' line:</p>
  <pre><code>   try:
        # Try to get object 1 (may or may not exist)
     except:
        # Try to get object 2 (may or may not exist)
     else:
        try:
           # Try to append object 2 (which may not exist) to object 1, which has been retrieved already
        else:
           # Do action only required on composite object
        finally:
           dummy = 1
  
     # Do stuff with the retrieved object/composite object
  </code></pre>