[Python-Dev] PEP 340 -- loose ends

[Reinhold Birkenfeld]

Shane Hathaway wrote:

> For each block statement, it is necessary to create a *new* iterator,

Right.

> since iterators that have stopped are required to stay stopped.  So at a
> minimum, used-defined statements will need to call something, and thus
> will have parentheses.  The parentheses might be enough to make block
> statements not look like built-in keywords.
> 
> PEP 340 seems to punish people for avoiding the parentheses:
> 
>     transaction = begin_transaction()
> 
>     transaction:
>         db.execute('insert 3 into mytable')
> 
>     transaction:
>         db.execute('insert 4 into mytable')
> 
> I expect that only '3' would be inserted in mytable.  The second use of
> the transaction iterator will immediately raise StopIteration.

Yes, but wouldn't you think that people would misunderstand it in this way?

Reinhold

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