[Python-ideas] Fast context creation

[Jonas Wielicki]

Hi Clint,

(this is a bit of nit-picking, but kind of supports the OPs concerns
about intent)

On 27.11.2014 17:01, Clint Hepner wrote:
> On Thu, Nov 27, 2014 at 9:24 AM, Stefano Borini <
> stefano.borini at ferrara.linux.it> wrote:
> 
>> On Thu, Nov 27, 2014 at 11:30:40PM +1100, Chris Angelico wrote:
>>> You could abuse try/finally for this purpose.
>>>
>>> try:
>>>     whatever you need to do
>>> finally:
>>>     my_widget.setFocus()
>>
>> I thought about this solution, but I am concerned about communication of
>> intent. Using the try
>> communicates to a code reader that the code inside is expected to throw,
>> which is not the case.
>>
>> If there is absolutely no possibility of an exception, you don't need any
> special construct. Just use
> 
>     whatever you need to do
>     my_widget.setFocus()
> 
> Otherwise, you are tacitly agreeing that an exception *might* occur, so
> try/finally is not misleading.

Not neccessarily. try/finally can also be used to do something in all
return paths:

    def foo():
        try:
            return True
        finally:
            print("foo")

will print foo and return True.

There is no way this can throw, nevertheless try/finally can be useful
if you have to do some clean up and have several return paths.

regards,
jwi

> 
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