Proposed new syntax

[MRAB]

On 2017-08-10 20:11, Jussi Piitulainen wrote:
> MRAB writes:
[snip]
>>> How about these?
>>>
>>> [x + y for x in (0, 1, 2, 999, 3, 4) while x < 5 for y in (100, 200)]
>>>
>>> [x + y for x in (0, 1, 2, 999, 3, 4) if x < 5 for y in (100, 200)]
>>>
>>>
>>>
>>> Thanks for your comments!
>>>
>> There's a subtlety there.
>>
>> Initially I would've thought that the 'while' would terminate the
>> iteration of the preceding 'for', but then when I thought about how I
>> would expand it into multiple lines, I realised that the 'while' would
>> have to be expanded to "if x < 5: break", not an inner 'while' loop.
> 
Oops! Of course I meant "if not (x < 5): break".

> I wonder how such expansions would work in general.
> 
> [x + y for x in (0, 1, 2, 999, 3, 4) for y in (100, 200) while x < 5]
> [x + y for x in (0, 1, 2, 999, 3, 4) for y in (100, 200) while x < y]
>