[Python-Dev] PEP 340 -- loose ends

[Eric Nieuwland]

Reinhold Birkenfeld wrote:
> Shane Hathaway wrote:
>> 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?

This could be solved if the translation of

         block EXPR1 as VAR1:
             BLOCK1
would change from:
         itr = EXPR1  # The iterator
         ret = False  # True if a return statement is active
         ...etc...
to:
         itr = iter(EXPR1)  # The iterator
         ret = False  # True if a return statement is active
         ...etc...

--eric
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