Try-except-finally paradox

[wxjmfauth at gmail.com]

Le jeudi 30 janvier 2014 06:56:16 UTC+1, Jessica Ross a écrit :
> I found something like this in a StackOverflow discussion.
> 
> >>> def paradox():
> 
> ...     try:
> 
> ...             raise Exception("Exception raised during try")
> 
> ...     except:
> 
> ...             print "Except after try"
> 
> ...             return True
> 
> ...     finally:
> 
> ...             print "Finally"
> 
> ...             return False
> 
> ...     return None
> 
> ... 
> 
> >>> return_val = paradox()
> 
> Except after try
> 
> Finally
> 
> >>> return_val
> 
> False
> 
> 
> 
> I understand most of this.
> 
> What I don't understand is why this returns False rather than True. Does the finally short-circuit the return in the except block?

========

The paradox is, in my mind, that the fct paradox() is
programmed to be paradoxal.

Compare with:

>>> def noparadox(i):
...     try:
...         a = 1 / i
...         print('Process')
...     except ZeroDivisionError:
...         print("ZeroDivisionError")
...         a = '?'
...     except Exception:
...         print("Exception")
...         a = '?'
...     finally:
...         print("Finally")
...         return a
...         
>>> noparadox(2)
Process
Finally
0.5
>>> noparadox(0)
ZeroDivisionError
Finally
'?'
>>> noparadox('asdf')
Exception
Finally
'?'
>>>

jmf