Re: Access to return / exception context in finally block

>In your example when would isinstance(__exit_context__, ReturnContext) 
>be True and when would it be False? What would __exit_context__.value 
>be? I can't think of a sensible meaning for it. If no exception occurs, 
>is the value returned by f supposed to be 10/x or __exit_context__.value 
>+ 1 # whatever that is
>Best wishes
>Rob Cliffe

Dear Rob,

isinstance(__exit_context__, ReturnContext) would only be True, when the try, except or else block is left using a return statement.

__exit_context__.value  would be the return value of f(x), in that case 10/x. Currently it is not possible to access this value in the finally block, but it can be overwritten, as the return statement is compiled into a new RETURN_VALUE opcode.

In this example, f(x) would return 10/x + 1 if x != 0 else 0.

I think that this magic variable would make error handling much more easier. What do you think?

Best wishes

Marius Spix