try...finally is more powerful than I thought.

Peter Hansen peter at engcorp.com
Thu Nov 6 22:26:32 CET 2003


Brian Kelley wrote:
> 
> def res():
>      try:
>          a = 1
>          return
>      finally:
>          print "do I get here?"
> 
> res()
> 
> outputs "do I get here?"
> 
> I can't say why I didn't really expect this, the control flow is a
> little wierd as the function isn't really returning at the "return"
> statement but executing the bit in the finally: block and then
> returning.  I think :)

These results might also be of interest:

>>> def res():
...   try:
...    return 1
...   finally:
...    return 2
...
>>> res()
2
>>> def res():
...   try:
...    return 1
...   finally:
...    return
...
>>> res()
>>> def res():
...   try:
...    return 1
...   finally:
...    pass
...
>>> res()
1

-Peter




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