exit 2 levels of if/else and execute common code

[Neal Becker]

I have code with structure:
```
if cond1:
  [some code]
  if cond2: #where cond2 depends on the above [some code]
    [ more code]

  else:
    [ do xxyy ]
else:
  [ do the same xxyy as above ]
```

So what's the best style to handle this?  As coded, it violates DRY.  
Try/except could be used with a custom exception, but that seems a bit heavy 
handed.  Suggestions?